I spotted a Mobiletrak.com snooper at the grocery store [I-495 & US1, College Park] today. It's solar powered, mounted up on a light pole, and has more antennas than a Cat Detector van. There's a folded dipole for the FM monitoring, a VHF whip, a cellular curlie-Q, and something in a 0.5" dia plastic pipe 8" long.
Just don' get caught listening to the local Pacifica station....