Antenna Locations
I found that every antenna location was a compromise...I looked at lots of examples and Osh and mounted mine.
Two comm antennae are just behind the spar box under the pilot's seat. Outboard as far as possible, with joggled doubler plates tying in to the spar and outboard rib flanges. Not 3' apart, but as wide as they can be and still be in the fuselage.
The transponder antenna is aft of the rear spar, slight forward of the battery box area and outboard of the battery/baggage floor rib.
Best,
Mike