Rob:
I would not remove them (radials) I believe tuning would go to hell, if it even worked.
I had an old Sigma 5/8th up years ago about 8 ft above my tri-bander...worked fine.
I also had a AR-10 Ringo (10m antenna) 1/2 wave "stick" you could hear a difference off the end of the tri-band elements...was not truly significant but noticeable.
So, the beam can work that way, but would not bet it would not affect tuning and performance for BOTH antennas.
Make sure you use a very strong mast (double wall thickness/Steel) you are adding a lot of wind load.
I had "black pipe" mast about 18 foot above tower...Huge thrust bearing at top to hold mast in place.
Tri-bander was about 5 ft. above tower/2-meter beams then the GP at like 80 ft base...
at one point.
When first installed had just the tri-bander and GP...worked fine...
GOOD Medium/HD duty rotor and bearing at top of tower is a must here in the Mid-West (IND) weather.
I used a Alliance HD73/Yaesu thrust bearing on my free standing 54ft tower...
I have a Tail twister II for the newer tower for the big tri-bander plus 2 and 6 meter beams.
I would suggest nothing smaller than a HAM III or
Yaesu 450 for your set-up
GL
All the Best
Gary
G-450A YAESU G450A 10 SQ FT ROTOR (rlham.com)
Roger, shows these Out of Stock...he sells them fast at that price!!!!
Call them great people to deal with...Family/Ham business.
That's a Yaesu G-800DXA rotor on that antenna (6 elements on 25 ft boom for 6m) plus the 2m GP (16ft tall) @ 40-45ft to boom height.
GS-050 YAESU GS050 50mm THRUST BEARING (MAST DIAMETER 1-1/4" - 2") (rlham.com)
at the top of tower.
73
Gary