Today I installed the transponder antenna under the center of the fuselage and ran the RG400 cable to the transponder on the sub panel. Suggestion: It would be easier to install this antenna before the right side baggage floor is riveted in place as the antenna sits under the floor and access is tight. But not to worry, it's still doable if you already have the floor in. I began to install the RAMI GPS antenna on the top of the fuselage aft of the rear window, but I didn't have the necessary hardware to do it. I did run the RG400 antenna cable from the behind the baggage bulkhead thru the center tunnel and behind the center instrument panel. Now it's off to the aviation aisle at Lowes for the GPS installation hardware.