Two "covert" sites I know of in Waterloo, Iowa.
The first one, is a flag pole:
http://maps.google.c...2,28.8,,0,-9.77
The second, as posted above, is a cross:
http://maps.google.c...210.58,,0,-7.53
I never looked at who the carriers are for these towers, just thought it fit into the conversation that has been going on in this thread. They both blend in fairly well, though for years I wondered why we needed a pole that large for such a little flag.