The problem (well, one of them) that I see with this idea is that your radio's front end (antenna input) is looking at the signal across two terminals: the antenna input, and ground. The ground on a radio is connected to electrical ground in your house wiring, which then (for safety reasons) is connected to the earth through a ground. If you connect the antenna input to earth, you've effectively shorted the antenna terminals, at DC anyway. At RF, due to the various impedances involved, it won't be a short. But it certainly doesn't sound like it would be very effective.
I would expect that at some frequencies, you may get good reception, because the various impedances and wire lengths involved will work out to be if not ideal, at least reasonable. It's possible that some people have tried this, and lucked out that on a few frequencies they tried, it seemed to work. But yes, I'm skeptical also.