While I was adopting in my shack the SDR1000, I was looking for all the available kit for controlling all my antenna devices.

My antenna system (two towers) is about 100 meter away from my shack and I use a CELLFLEX as main coax.

The coax is shared between the two towers (a relays), and each tower has at least 5 antennas remote relays (10 antennas).

The K3TUF board was the right answer to my needs.

Phil provides you a kit with all parts, and you can get schema and photos (really helpful) on his site.

With the K3TUF UCB you can connect at least 16 devices with strong enough relays; you have 2 device more to get PTT  IN and OUT, for controlling Power Amplifiers, for example.

Now I don't manually switch any more my antenna devices as with a click on my Powersdr interface  I remotely control all my antenna system. Think about !