Here is a schematic of my home made radio switch

Here is a schematic of my home made radio switch. Works great too!!

The box you put it in is up to you and all the switches are DPDT...

This setup allows you to switch to any radio you want, quick and easy. The way this is designed, it will not allow you to have more than one radio hooked to the antenna at one time and also will not allow you to hook up directly to another radio accidentally. All the toggle switches are shown in their off position and remember, wire all the switches up using heavy bus wire.