Commonly Used Professional and Law Enforcement Bugging Frequencies
37.000 - 952 MHz FCC Surveillance Blanket Authorization

47 CFR 90.19 "Physical surveillance, stakeouts, raids..."
Straight AM/FM/WFM, FM-Subcarrier, SSB, QAM, Spread Spectrum, and Frequency Hopping. If encrypted, it usually uses in-band voice inversion or 56 bit DES. (Normally well under 2 watts... most below 5-150mw)

  9 kHz -   490 kHz   Carrier Current 47 CFR 15.219 Auth (250 mv max.)
490 kHz - 1.705 MHz   Lossy Cable     47 CFR 15.221 Auth (1000 mv max.)
450 kHz - 30.00 MHz   PLA Systems     47 CFR 15.207 Auth (30 mv@ft/30ft max.)

 25 -  50 MHz "Bumper Beepers"  ( 38 -  47 MHz very popular)
135 - 170 MHz "Bumper Beepers"  (150 - 170 MHz very popular)
450 - 512 MHz "Bumper Beepers"
903 - 904 MHz "Bumper Beepers"
904 - 912 MHz "Bumper Beepers" 
918 - 926 MHz "Bumper Beepers"
926 - 927 MHz "Bumper Beepers"

148 - 174 MHz Wireless Microphone
135 - 250 MHz Out-band Wireless Microphone 
174 - 216 MHz In-band Wireless Microphone 
350 - 440 MHz Common Video Frequency 
380 - 930 MHz Wide Band Hoppers 
806 - 824 MHz Wireless Microphone
851 - 869 MHz Wireless Microphone
905 - 930 MHz Popular Audio/Video Band 

1.1 -  1.3 GHz Common Video Frequency
1.4 -  1.5 GHz Common Video Frequency
1.7 -  1.9 GHz Common Video Frequency (1.710 - 1.755 REAL Popular at 1/10 watt) 
2.4 -  2.5 GHz Common Video Frequency (2.400 - 2.450 REAL Popular)
5.7 -  5.9 GHz Common Video Frequency (5.725 - 5.850 REAL Popular)
8.5 - 10.8 GHz Common Video Frequency

"Tactical" Bugs

225 - 400 MHz "Throw away" bugs (10uw-300mw Beer can bugs) 
290 - 330 MHz Micro-powered Bugs (5uw-10mw Cigarette Butt Bugs) 
180 - 430 MHz Spread Spectrum Wafer Bugs (1.5mm thick * 10mm * 2.9mm)

 30 - 500 MHz Tactical Repeaters (75mw-300mw) 
285 - 400 MHz Tactical Repeaters (50mw-10watts) 
100 - 152 MHz VHF Tactical Repeaters (300mw-25watts) 
135 - 174 MHz VHF Tactical Repeaters (300mw-25watts) 

VLF Emission and Subcarrier Detection

Common Eavesdropping Frequencies used by Amatuer Eavesdroppers

Professional and Law Enforcement Bugging Frequencies

Surveillance Device "House" Frequencies/Bands

Federal Surveillance Frequencies

Surveillance and Spy Satellite Frequencies

Spread Spectrum and Frequency Hopping Bug Frequencies

Bandwidth Resolutions and Filters

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