"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 ?