[TowerTalk] Need Vertical Advice...Want to use for "spotting"

[Aidehua@aol.com]

Read about the Comet CHA-250B.  This antenna is interesting to me, as  it 
covers all bands continuously, 1.5-50 MHz (I am an SWL, too).  

My ultimate plan is to put up my 70' tower, with multiple beams  (Steppir 
7-30 MHz antenna, 80m rotatable dipole, etc).
 
I thought it would be good to have a vertical as a "spotting antenna" to  
monitor band openings with omni directional capability....
 
I thought about the Steppir Vertical but this allows listening to only one  
band at a time, albeit very efficiently!  Then I thought about the  Butternut 
because it is a good vertical and allows simultaneous reception of  multiple 
bands.
 
The downside with both is that they're at roof level because of the radials  
requirement.  So, because of that, is a vertical worth it?
 
I had also looked at a Cushcraft but felt it had too much windload to mount  
atop my tower....Too tall!
 
Enter the Comet....Lightweight, broadbanded, low profile, etc.....Question  
is, will I get what I need by mounting this vertical atop my tower, which would 
 elevate this to almost 90'??
 
Do you know of other DXers who use a vertical for spotting openings??   I 
envision using my Icom 7800 to scan various bands so that I can focus on  
openings, switch to the beam and point/shoot.  Vertical are also good  for nets...
 
Your opinion would be greatly appreciated.
 
73,
Ed NI6S