[Repeater-Builder] Antenna spacing

[Jeremy (KB1REQ)]

This post does not nessicarily relate to repeaters but some of the same 
calculations can be applied.  I am interested in installing another two meter 
radio in my shack and was wondering what kind of spacing is needed as to not 
over load either of the radio's receiver.  I currently have an icom set up on a 
j-pole, and I have a 45 watt GM300 that I want to add. What would be the best 
placement of antennas to reduce desense. or otherwise damage the receivers.