The Nebra outdoor hotspot antenna connection would be N Type Female. The outdoor antenna connects directly to the enclosure. 

The Nebra Indoor hotspot antenna connection would be RP-SMA Female.  The Antenna connection is N-Type Male. The Pigtail that the antenna comes with is N-Type Female to RP-SMA Male. If you’re connecting from the indoor units and running it outdoors, you’ll need the RP-SMA MALE to N-TYPE Female on the cable. 

We would recommend lesser the better but keep it below 25ft.  For LMR-400 at 900mhz, at every 100ft there is about 3.9db loss. 

SMA male connector, SMA female connector, RP-SMA female connector, RP-SMA male connector