Antenna to mast distance?

[338_MtRushmore]

I'm wanting to swap my A-99 for a GP-9. If I decide I still want a a vertical 10/11m, I was thinking about a 4' standoff with a whip and a wire hanging down. 4 feet would be plenty of distance to talk local on 10m without hurting the 2m performance much, I think?

 

[338_MtRushmore]

I still haven't found the answer, but I'm pretty sure 1/4 wave is plenty of distance. Good news is the GP-9 is pretty bad ass. I am pretty sure I'm going to be "Mr. relay" now, but I'm not sure if that's good or bad yet.

I can hit all the locals on 10m ok enough with 100 watts on the end fed that I don't think a vertical will be necessary. I guess it was an unnecessary dumb question.

 

[Cutlass327]

I just googled it to see what the GP-9 looked like, there was a picture in the images section of 3 in a row on a cross beam type setup. Dunno how they would affect each other, they looked different lengths, so different bands, but an idea?

https://www.soara.org/dstar/repeater_pics/dstar-photos-Images/0.jpg