The annual strange antennas contest
is the last weekend in May.
I am contemplating using my new roof. I just got a steel roof on my house. The carport is aluminum. These surfaces are parallel and about 7 inches apart, and not connected electrically. The carport is bolted to the concrete driveway, so it is somewhat grounded at RF. It is a single story house, so they are both pretty close to the concrete slabs.
I cannot imagine the feed point impedance, but I expect such an antenna would be very broadbanded.
The roof is approximately 10 m x 20 m. The carport is 3.5 m x 14 m.
I have read plenty about Ufer grounds for DC. However I cannot find anything on how concrete performs at RF.