The bottom pier pin section of R65 was modified for a 2" mast, thrust bearing and rotor plate.
The 20 meter OWA tower.
The 40 meter tower at 150 feet.
The 40 meter tower with the MonstIR's (40 thre 6 meters) at 200 and 100 feet. There is also a SteppIR (20 thru 6 meters) at 60 feet.