Kilvey Hill uses 21, 24, 27 (HD), 25, 22 & 28 (plus 34 Local). So gain for 21 to 28 are the only really relevant ones here.
Yours is 6dB-/+0.5dB vs 9.5 to 12.7 --- so only 4db at 21 and 6.2 dB at 30.
Wolfbane data was 79dBuV/m clear line of sight and 'set top aerial' on your AVForums thread...