Last night, I put my Rangeman 9400-1 and GW-5000-1JF on my desk facing in the same (wrong) direction. Fort Collins, Colorado is east of my home in northern California and I put both watches down facing west, just to see what would happen. The Rangeman picked up a signal but the GW-5000-1JF did not. I'll test it again over the next few nights in different positions.
Have you found much variation in how well these (or other) models are able to find a signal? I realize it will vary for each of us, depending on location, weather, and other factors.