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Andy writes:
I would like to hear some discussion/advice on the feasibility of putting an antenna for, say, 30m in the attic versus on top of the roof... Here is the situation : The roof peak of my house is about 50 feet and is straight. Given the need for a dipole which is 44 feet wide, it can be mounted in either of two places: 1) Just above the roof peak, straight along it, about 1 foot above. 2) Just below the roof peak,inside the attic, about 1 foot below . Let's assume there are no other options... So it sort of boils down to whether the wood and asphalt barrier , free of metal except for an occasional nail, actually attenuates the signal enough to bother about, or affects the antenna impedance enough to bother about..... Having made dozens of ham antennae over the last 40 years in configurations that probably violate the laws of physics and having had them work, I, personally, haven't found that such a difference in the antenna placement makes a hill of beans worth of REAL difference (no pun). But a lot of guys here have been doing this for 40 years also, and I'd really like to see what anyone has to say about it..... I generally use one rule of thumb on antennae: " If when I connect the antenna to the receiver, the background noise of the receiver increases, the antenna is doing a good job"..... Yeah, I know, but it needs some thinking about because if the cosmic noise level picked up by the antenna is higher than the receiver noise level, then it has to be working........assuming it is cut to the proper frequency for the band used..... So, what about it ? Anybody want to put in their two cents worth ? Andy W4OAH |
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