I always used the center screw on the cover, using the EGC. Back in the analog TV days you could get a decent picture on a TV with that.
Later I strung a long wire antenna to a post we installed behind the house. I wired it to my "All American" tube radio for AM DX'ing.
I would be scared to do that here because of lightning. It was pretty cool though for a kid. On a clear winter night I could get radio stations from a thousand miles away.

Greg Fretwell