Bought the RAMI AV-17 bent whip antenna for the belly and the RAMI AV-10 straight antenna for the planned two coms. The bent whip will mount on the centerline under the elevator pushrod, the backing plate fits perfectly in that space. The straight antenna on the top can't go on the centerline because of the stiffener. I decided to use nutplates for the antennas so they would be easy to pop off if ever needed. The plates will be riveted to the skin to make a good electrical connection.