Today I installed both the VHF and Transponder antenna's.
Yesterday a friend (Keith) showed me how to terminate the TNC connector for the transponder, the same pretty much applies to the BNC's as well, so today I made up the remaining 3 connectors and terminated them to the RG400 cable. I am using this for both the radio and transponder as it has superior shielding.
The ANL fuse should help reduce noise and also same the panel if the alternator goes nuts.