"Ralph Mowery" wrote in
nk.net:


"Dave Oldridge" wrote in message
...
Chris W wrote in
news:IT3tf.45644$ih5.19066@dukeread11:

I want to put a short 2 meter yagi and a long 70cm yagi on the same
vertical mast. The 70cm will be a horizontally polarized, center
mounted 17' boom and the 2 meter will be a vertically polarized,
end mounted 6 foot boom. How far apart do they need to be? I will
only be transmitting with one at a time but one could be receiving
and the other transmitting, the 70cm will be for ATV receive only
for now.

A good rule of thumb is to separate them by at least a half-wave at
the lowest frequency. In this case that means about a meter (39")
apart.


Sofar all the answers are assuming the question is will one antenna
affect the other antenna. One other thing to look at is will the
transmitter 'kill' the receiver of the other rig ?

Indeed, though not too likely since the frequencies are a fair bit apart.


--
Dave Oldridge+
ICQ 1800667