Will do! Although trying to model an elevated steel roof next to my antennas is beyond my ability. Elevation (air gap) update! Internet anecdotal I know .... 1) Hearing a few 160m cw contesters in neighboring 7 district at 3:30pm in the afternoon! Big guns for sure.. 2) 80 meters - when totally on ground, I noticed that there was an obvious change in band noise when quickly going from the low end to the high end of the band. So much so, that I always readjusted my volume a little bit to compensate. Not any more - band levels are the same from low to high. 3) 160m - other than the possible fluke of big-gun contesters above, my normal band level noise is equal across the band from low to high. The little "dog" version with no matching had me toggling the secondary preamp on and off depending. Now I think I can live without toggling in the secondary rig preamp. Yet still to early to really tell. Heh, maybe N6LF was onto something! Purely anecdotal report from me I know, but it's what I've observed so far.