The belly location between gear legs is not the problem. Anywhere on the belly is fine (but consider placing it slightly aft of a line directly between the gear legs in order to accomodate a jacking-cradle for maintenance purposes.)
Directly beneath one of the pilot's seats is my personal suggestion (after personally viewing scores of them there that never had a problem.)
It sounds as if your problem might at least partially be your avionics shop. Their opinion of the cowl lip "blocking" the signal is patently ridiculous, and brings their credibility into question.
It is most likely a connector and/or cable issue that you are fighting. A common volt/ohm meter is not adequate to trouble shoot that cable because continuity may appear fine when in fact there is a leak when your AT-150 blinks-out a 100 watt burst.
XPNDR antenna location
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GAHorn
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Re: XPNDR antenna location
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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