[TowerTalk] Exploring another option re interaction 40/15 on same tower

[StellarCAT]

Ok ... so the plan is to have 6/6 on 15M at 90/45 and I’m worried about (the unknown) interaction from a 4 el 40 mounted 34’ above the top 15. 

One option I have is to simply rotate the 40M 90 degrees and mount it that way. I already have the 80/75 dipole turned that way so the rotor has to have an ‘offset’ reading capability (Green Heron) ... so why not just ‘extend’ that to 40 as well. I have a rugged mount that will allow it to be mounted on the 1.5” leg of the Rohn 45 with an arm that goes out to a second leg for added reinforcement ... 

I don’t know if there is an adverse effect between 80 and 40 – the 80 dipole is ~76’ long with hi-Q coils at the center and 26’ T bars out 2/3rd of the way to the end... 

There might still be an issue of the boom of the 40, 42’ long, interacting with the top 15 but it would be considerably less than the full antenna I’d guess... but only a guess. 

does anyone have any issues with this? I know the wind load is going to be changed to put it lightly ... but with 6 antennas on this tower – all substantial in size that might actually be a good thing making it less susceptible to the desire to ‘point it in to the wind’ (for as we all know we can’t always do that). 

thoughts?

Gary 
K9RX