- Nov 7, 2004
Would an 11 meter dipole 20 feet above ground but in the attic with asphalt shingles, work any better than the same antenna only 5ft above ground but outdoors?
It does help. Thank you. The cross polarization thing is interesting. I never thought of that. Learn something new every day!For 'local' work, the greater height will give you quite a bit more 'line of sight' range-as long as the roof doesn't attenuate the signal. In both cases, you may have an issue talking with stations using vertical polarization- the cross polarization loss (assuming 11 meters) could be as much as 20-30 Db-which would be several 'S-units'. For other situations the greater height will lower the 'radiation angle' meaning more signal will hit the ionosphere at usable angles.
Hope this helps.
Wasn't sure what you were trying to accomplish. If the antenna is for CB, a dipole is not he best choice regardless where it is located due to the polarization issue and the fact that it is somewhat directional.Sorry. Saw this and thought I was in the right place.
"For all topics related to receive antennas used on HF, MW, LW, etc. For transmit antennas use the Amateur Radio Antennas forum."
So anyway, lets call it a 10 meter dipole.
That Imax 2000 is a fairly good antenna! You will be able to use it on several bands with a tuner.Well, the dipole in the attic didn't work well at all. My discone antenna 20 feet up outside works much better, but still only receiving clearly on ssb from 20 miles maybe, and not getting out that far on tx.
Next is the Imax mounted on the same mast as the discone I think. Warming up to near fourty into next weekend, so we'll shoot for getting it up then. I was going to try a Sirio Gain Master, but, read that it is fairly narrow banded and doesn't like being near any other antennas.