You are doing great! However, the cable from that base needs a heavy converter part to change it to an SMA plug used by the RC mod. If you buy it with the SMA plug to start, you save weight and money and some minor signal loss. Black (Domed) Magnetic Mount - RP SMA Plug Connector - HMA3-RSPA10
Right. Try to avoid adapters.. There is magnet mount for almost every plug.
i didn't find one for the bigger antennas that are using N-female so I lade my own one and same time using a better Cable. There are these magnet trays used in car garages/workshops to hold screws and parts. I bought 2 If them for a total of 12$ drilled a whole and put my own N-male plug there with 4 small screws holding it..
used a LMR240 and crimped/soldered Rp-SMA. It's so was to make your own cables. For small antennas using SMA you can get magnet mounts for 18$ or so. Tp-link got some. Using the Rf-linx with the 8dbi or 12 dbi omni antennas does the job for 90%. Curious to hear how it goes with the SAX version amps.