I want to stack 2 PDL II's.

[Dave239]

I just acquired 2 brand new PDL II's and I'm considering stacking them. Does anybody know how far apart the two antenna's should be from each other? what is the best way to co-phase them as well?

 

[Tallman]

Ideally 1/4 or 1/2 wave apart. You can use the Wilkinson matching network to maintain your 50 ohm impedances on each antenna and still have the 50 ohms to your feed line from the transmitter. Even though this was originally for higher frequencies it will work at lower ones.

https://research.sabanciuniv.edu/12076/1/motlpdf.pdf