[mythtv-users] Antenna amplifier

David Brodbeck gull at gull.us
Tue Aug 5 17:15:00 UTC 2008


Allen Edwards wrote:
> It may also help to have the two antennas close together, I don't know. 
>   This point is, if the signals are in phase, they will add and not 
> notch up the passband.  You can actually take two identical antennas 
> pointed in the same direction, space them apart on the pole, and combine 
> them for added gain but that is a well controlled situation.

The trick, of course, is that if they're in phase on one channel they 
won't be on another.  This is where you get the weird notch effects -- 
if they happen to be close to 180 degrees out of phase on one particular 
channel, they'll neatly cancel out each others' signals.



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