This sounds like a simple antenna#1 & amp & antenna#2, just to strengthen an outdoor signal.
There is similar hardware for GPS indoor reception.
buy two XM/Sirius antennas and buy one amplifier and some cable and hook them up.
30x5 feet is very odd shape, sounds like an Environmental test cell for autos.
Indoors you will have some peaks and nulls in the antenna pattern as you move around the room.
It's been awhile, did you ever do this project?
kch.