Cheekykid

I've been working today on this for 4 hours without success.

I moved in to a new place a week ago which has a sky dish pre-installed so in total i have 3 dishes including my wave frontier T90 and Triax 110. My problem is that with my wave frontier i receive 28.2 with a weak signal. It doesn't matter if i move my dish or lnb the signal remains weak. I can receive 13,16,19,23.5 with no problems and full signal with the same dish. The funny thing is that the sky mini dish picks up 28.2 with 95% signal while the wave frontier struggles with 80% or less. I have tested the receiver and lnb with another dish and they work fine so its the dish that creates the problem. If i can receive some satellites with full signal why can't I do the same with 28.2? Any ideas folks?