I have this directly attached to a 5.8 dBi antenna on my window-mounted finestra and getting good rewards while waiting on my outdoor setup to arrive.
Is used these for my lmr400, I’d imagine they’d work on lmr600. Do you have a lightning arrestor? You’ll want one to protect ur hotspot from static charge.
https://www.amazon.com/dp/B07V34ZXQY/ref=cm_sw_r_cp_api_glt_i_1WVGFZ0BRSNQENC82VMT
I am adaptor- challenged! So for $11, you get four different ones to make the connection work.