We just paid on average, $150 per aircraft for an avionics tech to come to use with his portable equipment and complete the two year check on 4 gliders and a tow plane. $125/aircraft plus shared travel expenses.

From what I can find on TABS, it can be about the size on a Nano GPS reciever, self contained battery operated, but no details about transmitter antenna requirements. TABS is designed for gliders, free balloons, hang gliders and parachute, para gliders. So it could be about the size of a SPOT and carried by the pilot, not the aircraft.

At a reasonable cost, it's a lot better than being grounded. How much did you pay for your SPOT and Nano?
BillT