You'll want 108 - 138 mhz coverage. The lower end is for the VOR /
TACAN signals. Sometimes there is a voice signal instead of the morse
code identifier.

Actually what he will want in addition to the 225-400 is the 138-144 band in
AM. That low VHF band is where F-16s and some of the other acft engage in
air-air comms.
Voice use of TACAN freqs has been claimed by a few, but in actuality has been
images of higher freqs. In older scanner radios, comms could be heard 21.4 to
21.6 MHz higher or lower than the freq actually used. Use of TACAN freqs for
voice is an old wife's tale. Now that scanner radios are not prone to the
images, no voice comms are ever heard in the TACAN range.

AL STERN Satellite Beach FL (28-11N 80-36W) monitoring
 Patrick AFB (KCOF)  NASA-KSC Shuttle Landing Facility (KX68)
 Avon Park Bombing Range (KAGR)  Cape Canaveral Air Force Station (KXMR)
 JSTARS E-8 Acft Integration Facility, Melbourne IAP (KMLB)
 Worldwide Military HF Communications
 Life Member: Missile, Space and Range Pioneers.
 http://hometown.aol.com/allanstern/m...age/index.html (My Freqs)
 http://hometown.aol.com/scanaddict/index.html (My Equipment)