[TowerTalk] antenna spacing

[Gregg Seidl]

I want to mount 2 M2 432-13WL's side by side to save mast space. On the same mast I'll have a M2 2M-18XXX and a Cushcraft D-40 which is a 40 meter rotatable dipole. I want to mount the 432 antennas lowest on the mast on an upside down U frame. My question is what is a good rule of thumb to use between the 432 elements and the horizontal cross brace. I'm think something like like a wavelength or about 2 feet at 432Mhz. Any other thoughts?

  Gregg  K9KL