Ok, enough circular reasoning
What he asked was simultaneous vertical and horizontal.
Circular polarization requires a 90 degree phase shift which technically isn't simultaneous.
What I've found works best is vertical for local base to mobile and base to base comms, but horizontal for DX TRANSMITTING and DUAL (simultaneous) polarization for DX RECEIVING only.
I've found horizontal polarization works best for DX transmitting because the best gain seems to be had by the 6+dB ground gain afforded by horizontal over vertical, but also, horizontal seems to approach the F layer more effectively than does vertical, however, I use the mix position on my switchbox when receiving to avoid the deep fading of DX signals as they pass through one polarization to another, and back, as Shockwave pointed out in a previous post.
Perhaps another thread could be opened to discuss the finer details of circular polarization, it is an interesting option,
- but simple dual polarization is a different option and actually requires IDENTICAL coax type & lengths to achieve, otherwise it's headed in the direction of circular polarization.
I hope this helps simplify not confuse.
