Both units have been cleaned & lub'd with aircraft lub:
-40 to + 140 rated.
The TR-44 good for small HF yagi or vhf-uhf ant's.
The HAM IV good for large HF beams or several vhf-uhf ant's.
TR-44 $130. shipped
HAM IV $180. shipped
Located Rochester,NY
Also have several mast adapters, most missing U-bolts: $10 to 15 each +
shipping.