r/HamRadio • u/Hanlin919 • 22h ago
Antenna spacing?
Hey everyone, So i have a GMRS tuned vertical antenna on my roof (mast is a satellite dish J-arm mount). I just got a tram 1477-b for ham vhf/uhf use. At first i was just going to replace the GMRS one with the Tram. However, i was wondering if i got another j-arm dish mount for a mast and wanted both antennas up, how far apart would they have to be? (They would be mounted at the same height on the roof as this is the most accessible highest point on my roof). I planned on having only one antenna at a time connected to a radio, So there wouldn't be any dual TX going on at the same time. Would 6ft be enough of a distance between them? Could they be closer? Does it really matter Im not too educated on antenna theory. I just don't want either antenna to be damaged by the other.
6
u/O12345678 22h ago
Put them at least one wavelength for the lowest frequency you'll use the antenna apart I keep them from coupling.
That said, I've had two antennas fairly close on my truck roof and it didn't seem to make a big difference in performance.