This Remote Coax Switch lets you remotely using your home WiFi, switch up to four HF antennas. The DC power used by the switch is injected into the coax power using a Bias T. There is no need to run long wires from your radioshack to the antenna. This switch is also controllable using the internet. Making it ideal for operating a remote station.
https://github.com/0x9900/AntennaSwitchRemote Controlled Antenna Switch Posted by Fred C (W6BSD) on Nov 06 2020
https://0x9900.com/remote-controlled-antenna-switch/