R-N-R said:
Don't duel antenna have to be mounted 8' apart from one another?
The short answer to that is "no". Although theory says the optimum separation is 9', the real world rarely conforms to theory... or the lab.
As an example, years ago I put a cophased set of 18" center-loaded hustler antennas on a '76 Pinto wagon. They were mounted to the roof gutters... far less that the "optimal" 9 feet.
I hooked up to a little 23-channel Midland radio (this was before 40 channels) with a Turner JM+2U power mike - no mods. That setup out talked most of the truckers and several guys I knew that were running 100 wat linears.
The MOST critcal parts are:
1 - Use the best coax you can get your hands on. Yes, cophased antennas require different coax than a single antenna. Some cophase harnesses are just junk. Firestik, and others, sell high quality cophase harnesses.
2 - Go to a wide open area with no trees, buildings, or other obstructions and properly adjust your antennas to the lowest SWR you can get.
I had those little Hustlers down to a SWR of 1. 2. Everyone said I'd be darned lucky to get them down to 1. 5.
The bottom line is... If you like it, try it. Just don't cut any corners.
Bob