Abilene has a EDACS digital ProVoice trunked system
http://www.radioreference.com/apps/db/?sid=5104
There is no scanner currently made that will pick up ProVoice digital audio.
The system is also capable of analog audio but I don't know if it is used.
Any current Uniden, GRE or Radio Shack trunktracking scanner should be able to receive analog EDACS trunking but there may not be any analog signals on Abilene's system.
I am too far away to hear Abilene and not familiar with what is going on there.
Hopefully somebody else can give you a better answer.