The power splitter is a stackmatch with a extra RX port. Via the controllor you can select the disired antenna config

The powersplitter in build-in a hammondmfg case nr 1444-14. I Did order the enclosure at mouser.com.
A frontpanel layout for this box is avaible here. There is a drill template available for this enclosure as well.
Print the PDF on 100% and measure the drawing after printing. Check the layout BEFORE drilling!

The 1:2 balun is made on a FT240-61 core.

A photo overview of this project.