Quote:
Originally Posted by FrenchConnection
In performing the tests I found it very strange how there was such a limited window (with the existing antenna) where I could reliably get signal, and that raising the antenna much above the roof-line seemed to generally hurt reception.
I guess my questions are:
1) Is there a good explanation on why raising the antenna would hurt reception? (I thought KTMF was LOS, for which higher is better)
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Your existing antenna location has the roof in the foreground below the antenna. The new location has bare ground. The signal is reflecting off the ground and reinforcing incoming the signal.
To understand why, read this:
http://www.hdtvprimer.com/antennas/siting.html
Especially this section:
"The ground reflection can be very helpful. Assume the power in the incident wave is P. If the reflection is 100% efficient, you might expect the power in the overlapped area to be 2P. But instead it will vary from 0P to 4P. (Power is the square of voltage. Where the voltage doubles, the available power goes up by 4.)
If you can put the antenna in the most intense spot, it will collect 4 times as much signal as with no ground reflection (assuming a 100% efficient ground reflection)."