Universal Licensing System
WRKB403
311 S WACKER BUILDING LLC
License details
| ULS identifier | 4360578 |
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| Call sign | WRKB403 |
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| Radio service | IG |
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| Status | A |
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| Grant date | 2020-12-04 |
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| Expiration | 2030-12-04 |
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| Frequency range | 451.5 - 467.775 MHz (5 frequencies) |
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| Locations | 3 |
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| Representative location | CHICAGO, COOK, IL |
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| Coordinates | 41.8779167, -87.6368056 |
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| Source archive | l_LMpriv.zip |
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| Dataset refreshed | 2026-08-02 01:22:02 |
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Licensee
| Name | 311 S WACKER BUILDING LLC |
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| Applicant type | L |
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| FRN | 0030231989 |
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| Location | CHICAGO, IL |
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| Address | 401 N MICHIGAN AVE, SUITE 1300, CHICAGO, IL, 60611 |
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| Phone | 3126928173 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FB2 | 451.50000000 | | | 100.000000 | 50.000000 | |
| 2 | 1 | MO | 451.50000000 | | | 4.000000 | 4.000000 | |
| 1 | 1 | FB2 | 451.85000000 | | | 100.000000 | 50.000000 | |
| 2 | 1 | MO | 451.85000000 | | | 4.000000 | 4.000000 | |
| 2 | 1 | MO | 456.50000000 | | | 4.000000 | 4.000000 | |
| 3 | 1 | FX1 | 456.50000000 | | | 25.000000 | 25.000000 | |
| 2 | 1 | MO | 456.85000000 | | | 4.000000 | 4.000000 | |
| 3 | 1 | FX1 | 456.85000000 | | | 25.000000 | 25.000000 | |
| 2 | 1 | MO | 467.77500000 | | | 2.000000 | 2.000000 | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 451.50000000 | | 11K2F3E |
| 1 | 1 | 451.50000000 | | 11K2F2D |
| 1 | 1 | 451.50000000 | | 7K60F1W |
| 2 | 1 | 451.50000000 | | 7K60F1W |
| 2 | 1 | 451.50000000 | | 11K2F3E |
| 1 | 1 | 451.85000000 | | 11K2F3E |
| 1 | 1 | 451.85000000 | | 11K2F2D |
| 1 | 1 | 451.85000000 | | 7K60F1W |
| 2 | 1 | 451.85000000 | | 7K60F1W |
| 2 | 1 | 451.85000000 | | 11K2F3E |
| 2 | 1 | 456.50000000 | | 7K60F1W |
| 3 | 1 | 456.50000000 | | 11K2F3E |
| 3 | 1 | 456.50000000 | | 7K60F1W |
| 2 | 1 | 456.85000000 | | 7K60F1W |
| 2 | 1 | 456.85000000 | | 11K2F3E |
| 3 | 1 | 456.85000000 | | 7K60F1W |
| 3 | 1 | 456.85000000 | | 11K2F3E |
| 2 | 1 | 467.77500000 | | 7K60F1W |
| 2 | 1 | 467.77500000 | | 11K2F3E |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 311 S WACKER DR, CHICAGO, COOK, IL | 41.87791667, -87.63680556 | 180.000 m | BANT | 293.000 m structure / 296.000 m overall | |
| 2 | T | COOK, IL | | | | | |
| 3 | T | COOK, IL | | | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | | 293.000 m | | | | 293.700 | |
| 1 | 2 | T | | | | | | | |
| 1 | 3 | T | | | | | | | |
Control points
| Number | Address | County | Phone |
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| 1 | 311 S WACKER DR., CHICAGO, IL | COOK | 3126928173 |
License history
| Date | File or call sign | Action |
|---|
| 2020-12-04 | WRKB403 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
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| ULS | 4360578 | 2026-08-02 01:22:02 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
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| Call Sign | WRKB403 | ULS 4360578 | 2026-08-02 01:22:02 |
| Status | A | ULS 4360578 | 2026-08-02 01:22:02 |
| Service | IG | ULS 4360578 | 2026-08-02 01:22:02 |
| Grant Date | 2020-12-04 | ULS 4360578 | 2026-08-02 01:22:02 |
| Expiration Date | 2030-12-04 | ULS 4360578 | 2026-08-02 01:22:02 |