I'd really prefer something that doesn't draw any attention. That's why I'm mainly looking into inverted vees, or something in the attic.

With only 5 feet of vertical clearance in the attic, I'd need some rather short firesticks for anything vertical.

Also, since something in the attic would be transmitting through overlapping inch thick concrete tiles, I'd really like to know if CB radios can even transmit through concrete before I go get a pair of 2 foot antennas, or rig up a pair if 5 feet in an L shape, or try some super fancy indoor base antenna...