Sorry, been swamped, but here's an interesting thingaroo I just realized:
When I first rec'd my Gainmaster I tested it against the Imax on the same pole & using the same radio/coax, 60' of 9913 (84% VF) working out to 1.98 wavelengths - call it 2 even.
The Gainmaster destroyed the Imax by: S8 - Imax, S9+3dB Gainmaster.
That was at 40.5' (1 & 1/8 WL) above ground and fed right at 2 WL.
However, when compared at 54' (1.5WL above ground) and with 2.5 WL of 3/8" hardline the SAME Imax beat the SAME Gainmaster by a comfortable 1 S unit.
Again, at 41' at a friend's home, using 4.5 WL of LMR400 HIS Imax comfortably beat HIS Gainmaster by about an S unit.
Now, not a very scientific test at all, I know, but in both instances when fed at the X.5 WL, the Imax beats the GM, but when fed at the X.0 WL, the GM comfortably beat the Imax, at the same height at which a different Imax beat a different GM when fed at an X.5 WL length of coax.
- Maybe relevant, maybe not, but definitely one of those things that makes me go, "Hmmmmmm".