I just ordered a 70 cm and 2 meter turnstile antenna set from Vinnant. I plan on setting up an omnidirectional station. I keep reading that the antennas should be 2 wavelengths above ground. That would be about 4 1/2 feet and 13 1/2 feet. I live in an established residential neighborhood with houses and trees all around. So ground mounting the 70cm antenna at 4 1/2 feet is not going to be a good location.
I currently have an omnidirectional vertical triband antenna that I use for a APRS SatGate where the bottom of the 11 ft antenna is at about 14 ft and that does pretty good.
So if I mount the antennas to the side of the house (1 story and so are all the other houses) so the antennas are above the roof line what would be a good height for the antennas ?
When receiving satellites, height is not really important, free sight and clean reception is.
As Jan said, height above ground is mostly used to optimize the takeoff angle on HF (1-30MHz), for VHF and UHF it’s clear line of sight that makes most sense.
Having the antennas sticking up above the roof level is a good idea, I use it on my RX antennas, unfortunately they’re lower than the main building but that roof is already housing beams for transmitting.
It’s also about keeping a good distance to noise and there’s a lot of that in out modern houses, keeping the antennas far away from these is a very good idea.
Perhaps a bit hard to see, but these are the RX antennas I currently have up and running:
Vinnant VHF, own QFH UHF, Diamond X-50N, survey GPS
Good idea to share some picture, here is part of my current UHF setup. On the roof of the garage is a Vinnant VHF Turnstile.
Thank you to you both for the quick and helpful replies.