I have a repeater that I need to have as tight a cardiod pattern as possible. I have looked at the dipole antennas such as the DB-411 and they don't really shut down the back door quite enough. Does anyone have any antenna modeling software that would show the result of adding an 18" wide screen to the back side of the mast on the DB-411? Does anyone have any experience in home-brewing a modification like this?
Dan Hancock N8DJP
