I have been trying to receive the state guard helo's and I have all three CP's frequencies plugged in 41.50, 149.800 & 373.900 in 3 different audio searches All, (Analog & Digital). I get what sounds like a signal on analog but nothing on the digital setting. It is not identifying the mode if it is in fact a communication of somekind. Also my next question is are they using encryption also? Now I do receive them on the TACN system when they land and take off for flight following in the clear. Now in the air I should be able to pick up the aircraft if they still use and of those frequencies. I am in Middle Tennessee so within ear shot of Nashville anyway. One more question if they do use the 41.50 is it in AM or FM because that is the one I have been receiving them on?