The StackMain Controller is an universal stackmatch control unit.
A StackMatch is a device where you can connect several antennas – normally it uses to support 3 antennas – and one output
It’s a different concept than an antenna switch (3×1) because with the StackMatch you can select more than one port at the same time.
This is the reason it includes an UN-UN (2.25:1) so when more than 1 Port (antenna input) is selected, the UN-UN is activated.
The StackMain can select any of the following antenna combinations: