SUCCESS!!
(I hope)
I spoke to a friend of mine who is a Texarkana, Ark. firefighter. He use to be a paramedic with LifeNet (or LeftNut as they are called locally, in fun of course) and was assigned to the Helo for a long time.
If his memory is accurate (and he is scary good with numbers), and if they haven't changed it, the LifeNet helo uses 155.205mhz. They don't get up to this neck of the woods all that often so if anybody can confirm this please let me know.
Crossing my fingers
Gus