Light-Sport Aircraft Yahoo group Transponder Antenna install

Is there any legal reason why I can't install my transponder antenna on the TOP of the plane between the wings?

See, I have a challenger and the whole bottom of the plane is fabric with a few braces made out of aluminum. It seems like it would be MUCH easier to just drill a whole and install the antenna on the metal covering than making a grounding plane and riveting it to the braces under the plane.

Also, it would move the antenna further away from the occupants.

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