Answer
Feb 19, 2024 - 08:25 AM
Vertical separation between antennas always provides better isolation than horizontal separation. If vertical separation is not possible, here are the suggested horizontal distances between various types of marine antennas, as recommended on page 31 of the issue of Sea Magazine:
Minimum antenna spacing (in feet)
| VHF | GPS | SSB | Radar | Cellular | SATCOM, etc. | |
|---|---|---|---|---|---|---|
| VHF | 3 | 3 | 3 | 2 | 2 | 3 |
| GPS | 3 | 0.5 | 4 | * | 5 † | 3** |
| Single Sideband (SSB) | 3 | 4 | 10 | 4 | 2 | 4 |
| Radar | 2 | * | 2 | 2 | 1 | 4 ‡ |
| Cellular | 2 | 5 † | 2 | 1 | 1 | 4 |
| SATCOM, TV, Data, Weather, Voice/FAX, Video | 3 | 3** | 4 | 4 ‡ | 4 | 6 |
* Outside of radar beam, either below or above.
** Below SATCOM beam.
† Cellular transmissions can interfere with GPS reception.
‡ Outside radar array by 6 feet.
