Attachment Exhibit A

This document pretains to SES-LIC-20191016-01311 for License on a Satellite Earth Station filing.

IBFS_SESLIC2019101601311_1962917

FREQUENCY COORDINATION AND INTERFERENCE ANALYSIS REPORT Prepared for GCI Communications Corp. HUSLIA, AK Satellite Earth Station Prepared By: COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 August 13, 2019

TABLE OF CONTENTS 1. CONCLUSIONS ............................................................................................................................................ 3 2. SUMMARY OF RESULTS ............................................................................................................................ 4 3. SUPPLEMENTAL SHOWING ....................................................................................................................... 5 4. EARTH STATION COORDINATION DATA .................................................................................................. 6 5. CERTIFICATION ......................................................................................................................................... 10 Frequency Coordination and Interference Analysis Report 08/13/2019 Page 2 of 10

1. CONCLUSIONS An interference study considering all existing, proposed and prior coordinated microwave facilities within the coordination contours of the proposed earth station demonstrates that this site will operate satisfactorily with the common carrier microwave environment. Further, there will be no restrictions of its operation due to interference considerations. Frequency Coordination and Interference Analysis Report 08/13/2019 Page 3 of 10

2. SUMMARY OF RESULTS A number of great circle interference cases were identified during the interference study of the proposed earth station. Each of the cases, which exceeded the interference objective on a line-of-sight basis, was profiled and the propagation losses estimated using NBS TN101 (Revised) techniques. The losses were found to be sufficient to reduce the signal levels to acceptable magnitudes in every case. The following companies reported potential great circle interference conflicts that did not meet the objectives on a line-of-sight basis. When over-the-horizon losses are considered on the interfering paths, sufficient blockage exists to negate harmful interference from occurring with the proposed transmit-receive earth station. Company DRS Technical Services, Inc. Unicom, Inc. No other carriers reported potential interference cases. Frequency Coordination and Interference Analysis Report 08/13/2019 Page 4 of 10

3. SUPPLEMENTAL SHOWING Pursuant to Part 25.203(c) of the FCC Rules and Regulations, the satellite earth station proposed in this application was coordinated by Comsearch using computer techniques and in accordance with Part 25 of the FCC Rules and Regulations. Coordination data for this earth station was sent to the below listed carriers with a letter dated 08/05/2019. Company DRS Global Enterprise Solutions, Inc. DRS Technical Services, Inc. Unicom, Inc. Frequency Coordination and Interference Analysis Report 08/13/2019 Page 5 of 10

4. EARTH STATION COORDINATION DATA This section presents the data pertinent to frequency coordination of the proposed earth station that was circulated to all carriers within its coordination contours. Frequency Coordination and Interference Analysis Report 08/13/2019 Page 6 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Date: 08/13/2019 Job Number: 190805COMSTC08 Administrative Information Licensee Code P3203 Licensee Name GCI Communications Corp. Site Information HUSLIA, AK Latitude (NAD 83) 64° 41' 54.9" N Longitude (NAD 83) 156° 23' 59.4" W Climate Zone A Rain Zone 2 Ground Elevation (AMSL) 60.96 m / 200.0 ft Link Information Satellite Type Geostationary Mode TR - Transmit-Receive Modulation Digital Satellite Arc 101° W to 212° West Longitude Azimuth Range 122.0° to 238.2° Corresponding Elevation Angles 5.4° / 5.3° Antenna Centerline (AGL) 5.18 m / 17.0 ft Antenna Information Receive Transmit Manufacturer Viasat Visasat Model 8345 8345 Gain / Diameter 43.5 dBi / 4.5 m 46.8 dBi / 4.5 m 3-dB / 15-dB Beamwidth 1.20° / 2.60° 0.80° / 1.60° 45K0G7W - 36M0G7W 60K0D7W - 36M0D7W Max Available RF Power (dBW/4 kHz) -2.7 -16.53 -2.7 -16.53 (dBW/MHz) 7.81 7.47 9.34 7.47 Maximum EIRP (dBW/4 kHz) 43.2 29.37 43.2 29.37 (dBW/MHz) 43.2 53.37 43.2 53.3.7 (dBW) 53.71 68.91 54.96 68.91 Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Frequency Information Receive 4.0 GHz Transmit 6.1 GHz Emission / Frequency Range (MHz) 45K0G7W - 36M0G7W / 3700.0 - 4200.0 45K0G7W - 36M0G7W / 5925.0 - 6425.0 60K0D7W - 36M0D7W / 3700.0 - 4200.0 60K0D7W - 36M0D7W / 5925.0 - 6425.0 Max Great Circle Coordination Distance 554.5 km / 344.5 mi 322.6 km / 200.4 mi Precipitation Scatter Contour Radius 613.2 km / 381.0 mi 101.4 km / 63.0 mi Frequency Coordination and Interference Analysis Report 08/13/2019 Page 7 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values HUSLIA, AK Licensee Name GCI Communications Corp. Latitude (NAD 83) 64° 41' 54.9" N Longitude (NAD 83) 156° 23' 59.4" W Ground Elevation (AMSL) 60.96 m / 200.0 ft Antenna Centerline (AGL) 5.18 m / 17.0 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -2.7 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 0 42.12 114.92 -10.00 100.00 -10.00 100.00 5 42.57 111.17 -10.00 100.00 -10.00 100.00 10 42.56 107.33 -10.00 100.00 -10.00 100.00 15 43.04 103.35 -10.00 100.00 -10.00 100.00 20 43.04 99.44 -10.00 100.00 -10.00 100.00 25 43.48 95.47 -10.00 100.00 -10.00 100.00 30 43.48 91.54 -10.00 100.00 -10.00 100.00 35 43.48 87.60 -10.00 100.00 -10.00 100.00 40 43.88 83.71 -10.00 100.00 -10.00 100.00 45 43.87 79.82 -10.00 100.00 -10.00 100.00 50 44.29 76.05 -10.00 100.00 -10.00 100.00 55 44.71 72.37 -10.00 100.00 -10.00 100.00 60 44.70 68.67 -10.00 100.00 -10.00 100.00 65 44.71 65.05 -10.00 100.00 -10.00 100.00 70 44.71 61.53 -10.00 100.00 -10.00 100.00 75 44.71 58.13 -10.00 100.00 -10.00 100.00 80 45.45 55.31 -10.00 100.00 -10.00 100.00 85 45.46 52.30 -10.00 100.00 -10.00 100.00 90 45.46 49.51 -10.00 100.00 -10.00 100.00 95 45.45 46.99 -9.80 100.00 -9.80 100.00 100 45.46 44.78 -9.28 100.00 -9.28 100.00 105 45.38 42.87 -8.80 100.00 -8.80 100.00 110 45.37 41.19 -8.37 100.00 -8.37 100.00 115 45.38 39.59 -7.94 100.00 -7.94 100.00 120 45.37 38.06 -7.51 548.10 -7.51 318.97 125 45.38 36.61 -7.09 460.36 -7.09 267.96 130 45.52 35.40 -6.72 327.07 -6.72 199.14 135 45.51 34.15 -6.33 220.78 -6.33 150.09 140 45.52 33.01 -5.97 135.47 -5.97 114.27 145 45.31 31.79 -5.56 100.00 -5.56 100.00 150 45.32 30.89 -5.25 100.00 -5.25 100.00 155 45.31 30.11 -4.97 100.00 -4.97 100.00 160 45.11 29.29 -4.67 100.00 -4.67 100.00 165 45.11 28.78 -4.48 100.00 -4.48 100.00 170 44.97 28.28 -4.29 100.00 -4.29 100.00 175 44.98 28.07 -4.20 100.00 -4.20 100.00 180 44.94 27.95 -4.16 100.00 -4.16 100.00 185 44.94 28.02 -4.19 100.00 -4.19 100.00 Frequency Coordination and Interference Analysis Report 08/13/2019 Page 8 of 10

COMSEARCH Earth Station Data Sheet 19700 Janelia Farm Boulevard, Ashburn, VA 20147 (703)726-5500 http://www.comsearch.com Coordination Values HUSLIA, AK Licensee Name GCI Communications Corp. Latitude (NAD 83) 64° 41' 54.9" N Longitude (NAD 83) 156° 23' 59.4" W Ground Elevation (AMSL) 60.96 m / 200.0 ft Antenna Centerline (AGL) 5.18 m / 17.0 ft Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz Interference Objectives: Long Term -156.0 dBW/MHz 20% -154.0 dBW/4 kHz 20% Short Term -146.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025% Max Available RF Power -2.7 (dBW/4 kHz) Receive 4.0 GHz Transmit 6.1 GHz Horizon Antenna Horizon Coordination Horizon Coordination Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km) 190 44.77 28.07 -4.21 100.00 -4.21 100.00 195 44.77 28.44 -4.35 100.00 -4.35 100.00 200 44.44 28.61 -4.41 100.00 -4.41 100.00 205 44.44 29.25 -4.65 100.00 -4.65 100.00 210 44.44 30.03 -4.94 100.00 -4.94 100.00 215 43.98 30.49 -5.10 100.00 -5.10 100.00 220 43.98 31.53 -5.47 138.54 -5.47 115.52 225 43.98 32.67 -5.86 224.62 -5.86 151.78 230 43.49 33.48 -6.12 331.79 -6.12 201.42 235 42.93 34.32 -6.39 466.30 -6.39 271.19 240 42.93 35.79 -6.84 554.47 -6.84 322.60 245 42.50 36.94 -7.19 100.00 -7.19 100.00 250 42.49 38.58 -7.66 100.00 -7.66 100.00 255 42.50 40.28 -8.13 100.00 -8.13 100.00 260 41.87 41.76 -8.52 100.00 -8.52 100.00 265 41.87 44.17 -9.13 100.00 -9.13 100.00 270 41.87 46.93 -9.79 100.00 -9.79 100.00 275 41.87 49.95 -10.00 100.00 -10.00 100.00 280 41.87 53.19 -10.00 100.00 -10.00 100.00 285 41.12 56.25 -10.00 100.00 -10.00 100.00 290 41.12 59.87 -10.00 100.00 -10.00 100.00 295 41.12 63.61 -10.00 100.00 -10.00 100.00 300 41.44 67.53 -10.00 100.00 -10.00 100.00 305 41.44 71.42 -10.00 100.00 -10.00 100.00 310 41.44 75.36 -10.00 100.00 -10.00 100.00 315 41.14 79.30 -10.00 100.00 -10.00 100.00 320 41.14 83.33 -10.00 100.00 -10.00 100.00 325 41.15 87.37 -10.00 100.00 -10.00 100.00 330 41.42 91.42 -10.00 100.00 -10.00 100.00 335 41.42 95.46 -10.00 100.00 -10.00 100.00 340 41.42 99.48 -10.00 100.00 -10.00 100.00 345 41.75 103.41 -10.00 100.00 -10.00 100.00 350 41.76 107.35 -10.00 100.00 -10.00 100.00 355 42.12 111.13 -10.00 100.00 -10.00 100.00 Frequency Coordination and Interference Analysis Report 08/13/2019 Page 9 of 10

5. CERTIFICATION I HEREBY CERTIFY THAT I AM THE TECHNICALLY QUALIFIED PERSON RESPONSIBLE FOR THE PREPARATION OF THE FREQUENCY COORDINATION DATA CONTAINED IN THIS APPLICATION, THAT I AM FAMILIAR WITH PARTS 101 AND 25 OF THE FCC RULES AND REGULATIONS, THAT I HAVE EITHER PREPARED OR REVIEWED THE FREQUENCY COORDINATION DATA SUBMITTED WITH THIS APPLICATION, AND THAT IT IS COMPLETE AND CORRECT TO THE BEST OF MY KNOWLEDGE AND BELIEF. Timothy O. Crutcher Frequency Planner COMSEARCH 19700 Janelia Farm Boulevard Ashburn, VA 20147 DATED: August 13, 2019 Frequency Coordination and Interference Analysis Report 08/13/2019 Page 10 of 10


Document Created: 2019-08-13 14:58:09
Document Modified: 2019-08-13 14:58:09
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