What's up with the ends of my antenna cables ?

I have never tried that scheme. Looks simple. The impedance should be close. My only concern is that the 75 ohm cable doesn't match the 50 ohm impedance of the antenna. I know that for every rule there is a caveat. I also know that FM really stands for f*****g magic!

Orion,
you said you are running 18' of 75 ohm. The diagram states odd quarter wavelengths of 75 ohm. That would be 9' or 27' of 75 ohm. Yours works good though? I wonder how the field strength would differ using a real co-phase harness. Might be fun to play with these two schemes just to measure the difference (or lack thereof).

 

1) FM is the industry standard for all Police, Fire and non CB/HAM and is above 29 mhz very widely used world wide. Only CB and Aircraft still use AM.

 

There is another Co-Phase harness you can buy that is just one piece of coax, and not three sections using a 3-way connector in the middle...Well, actually it's 2 pieces of RG 59 75 ohm coax...It uses 2 18' long RG 59 and the two cables are hooked together into one connector that screws onto the back of the radio. There is no 50 ohm coax with this design.

 

YES you don't need a 50 ohm feed line but using one now that makes the coax companys happy

 

This is how you stack antennas veticaly

stacked squailos .... using the same 75 ohm phasing coax into a 50 ohm feed ...

 

Actually, those antennas are horizontally polarized.

 

CORRECT but they are stacked verticaly