Mike, here is an easy to understand document about coax stubs written by K2TR. It has diagrams as well. https://www.google.com/url?sa=t&source=web&rct=j&url=http://n6ws.com/files/stubs.pdf&ved=0CCAQFjACahUKEwjt-MmhzOzHAhVFKx4KHfzRDpc&usg=AFQjCNFaMTMogKIBmNS8hRMWS6TCiWqh3A Jeff