Universal Licensing System
WRDU252
Sky55 at Central Station
License details
| ULS identifier | 4181478 |
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| Call sign | WRDU252 |
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| Radio service | IG |
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| Status | A |
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| Grant date | 2019-07-20 |
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| Expiration | 2029-07-20 |
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| Frequency range | 463.625 - 469.3 MHz (4 frequencies) |
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| Locations | 2 |
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| Representative location | Chicago, COOK, IL |
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| Coordinates | 41.8665278, -87.6241389 |
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| Source archive | l_LMpriv.zip |
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| Dataset refreshed | 2026-08-02 01:23:04 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FB2 | 463.62500000 | | | 50.000000 | 40.000000 | |
| 2 | 1 | MO | 463.62500000 | | | 40.000000 | 40.000000 | |
| 1 | 1 | FB2 | 464.30000000 | | | 50.000000 | 40.000000 | |
| 2 | 1 | MO | 464.30000000 | | | 40.000000 | 40.000000 | |
| 2 | 1 | MO | 468.62500000 | | | 40.000000 | 40.000000 | |
| 2 | 1 | MO | 469.30000000 | | | 40.000000 | 40.000000 | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 463.62500000 | | 7K60FXE |
| 2 | 1 | 463.62500000 | | 7K60FXE |
| 1 | 1 | 464.30000000 | | 7K60FXE |
| 2 | 1 | 464.30000000 | | 7K60FXE |
| 2 | 1 | 468.62500000 | | 7K60FXE |
| 2 | 1 | 469.30000000 | | 7K60FXE |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 1255 S Michigan Ave, Chicago, COOK, IL | 41.86652778, -87.62413889 | 181.000 m | B | 152.000 m structure / 152.000 m overall | |
| 2 | T | | | | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | | 152.000 m | V | | | 152.000 | |
| 1 | 2 | T | | | | | | | |
Control points
| Number | Address | County | Phone |
|---|
| 1 | 1255 S Michigan Ave, Chicago, IL | COOK | 3126621255 |
License history
| Date | File or call sign | Action |
|---|
| 2020-04-21 | WRDU252 | LETCNS |
| 2019-07-20 | WRDU252 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4181478 | 2026-08-02 01:23:04 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDU252 | ULS 4181478 | 2026-08-02 01:23:04 |
| Status | A | ULS 4181478 | 2026-08-02 01:23:04 |
| Service | IG | ULS 4181478 | 2026-08-02 01:23:04 |
| Grant Date | 2019-07-20 | ULS 4181478 | 2026-08-02 01:23:04 |
| Expiration Date | 2029-07-20 | ULS 4181478 | 2026-08-02 01:23:04 |