JST, Check out the RTI T2+ with the RP-6 RF reciever. I use this combination in almost every job, and I have not been disappointed. The RF range is stellar even with just one antenna, however you can daisy chain several for diversity.
With the old T2 it was fussing 9 out of 10 with the RF, now it is zero since I can add antennas anywhere I need them. Programming is very intuitive, you just have to find a supplier to sell you the product and the software, they now have "custom installer" policy to at least try to keep distribution to "qualified" persons. Hope this will start the comparison process.
www.rticorp.com