[Antennas] Beam-band question

[W0DXZ@aol.com]

A complicated question, with probably no good answer, but here goes. I have a 
dual band CushCraft 12-17 meter, 3 el beam, that I use on those 2 bands, but 
would like to use it on 15M as well. I can, with the use of my rig's  
autotuner, get a good SWR.  The question, is,  given the same conditions, power, 
distance, rigs and all that,  how much signal am I losing at the "other end", the 
other station,(or conversely, on receive)  if I use a beam such as this, vs 
same gain dedicated 15M beam?  Results are acceptable, but I can't help but think 
sigs would be better if I used a "real"   3 el 15M beam.  Is it worth buying 
a separate 3 el  CushCraft 15M beam? Discussion? 
Thanks!
Bob W0DXZ


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