I tried an experiment today. Since RS has such a liberal return policy, I took a chance on their little 15-2187 antenna. I hooked it up inside first, and barely picked up PBS. I got nothing from any other channel; the RS mushroom does much better.
Okay, then, I took it to the roof, assuming the performance would improve. It did not -- I could only get a signal from one channel (PBS), and that was weaker than the signal picked up by the mushroom, which also locks on NBC, CW, and Fox.
WTF? I didn't expect miracles, but I sure didn't expect this! Does it seem likely that the antenna is defective, or is it just that bad of a design? I had read some positive things about it.
Taking it back tomorrow...