In addition to 123.0250 AM Helo Air 2 Air Pilot Chat you might limit search between 450 to 460 FM .
Also, lQQk to your local LTR TRS networks. Here in SATX we at one time had 4 news stations using LTR TRS's.
Finally, it would not hurt to pull up outside your TV station and go into Signal Stalker mode for VHF/UHF & 800.
Happy Hunting

Michael-SATX