[AMSAT-BB] Coax length and connector style for M2 LEO antennas

I’m wondering if anyone has cable length recommendations for the M2 LEO antenna on a rotator.

I presume many people use a shorter length of LMR240 (or equivalent) and then switch to LMR400 (or equivalent) for the run to the radio. So I am just trying to determine the length of those short jumpers at the antenna.

Would 15’ be a good length?

What about connectors? For UHF side I will use N on the coax. On the VHF side, instead of a barrel adaptor connecting two PL259s, would it make sense to go VHF antenna -> PL259 - coax jumper - female N -> male N - coax to shack - male N -> female N - coax to radio - PL259 Or is it fine to leave them all PL259 / SO 239?

73 Erik K2ERK - FN20