I have two antenna's, an 80 and 40 meter fan dipole and the old 40 meter only dipole.
Both are the same 45 feet up and fed with coax.
The 40 meter one has slowly gone up to 3-1 swr for some reason, maybe it streched, the 80-40 meter antenna I just made and it was 1.2 to 1 at 7290 and both antenna's were somewhat broad banded.
When it is very wet or ice/snow covered, the antenna that normally has the 1.2 swr goes to 3-1, and the one that is 3-1 goes to 1.2-1.
This is very handy, but why does it happen?
Is this a trick question?
Both antennas are being affected the same way. It's just the affect is bringing one antenna back into resonance and the other out of resonance by the same amount.
I would fix the one that is out of resonance on clear days and disregard the affects of the snow. Or, leave it as is and you'll have one good antenna for snow storms.
Fred