I have own the Lab599 for several months and I have 10+ contacts (SSB).
Antennas used:?
My Antenna halfway Inverted L configuration approx 35ft.
Buddipole and Buddistick,
Chameleon hybrid micro CHA MIL 2.0 + Extension?
Elekraft T1atu. Bands 17,20,40 Meter
I have used several battery options to power the unit ranging from : TalentCell battery pack, and Bioenno battery. TX output ranges 5 - 8 watts.
Contacts made: ?NM, CA, MA, WV, VA, Mexico, Cuba?
So far I have been impressed by the unit !
Los AE2W