Here is a couple of pictures of the “business end” of my antenna switch. This was built with items that I collected at ham fests and a couple of proto boards from Radio Shack. I think I have about $50 in it.
Theoretically, it should be able to handle the legal limit, but I don’t have that kind of power available for testing. Worked great on all HF bands with 100W key down, though.
Home brewing is fun!