I recently acquired a 2.4m Channel master/ Andrews offset & to my dismay, it's not outperforming the 135cm I had to the extent I expected, especially on 4°W; I struggle to lock the HDs TP even with a dish this big. I get the TP but it's not stable. The TP stabilizes though when I join a C-band on offset conical scalar ring to my lnb. I use an Inverto Black Ultra but it's not designed to work on this kind of dish. The Black Ultra's feed horn is too small & certainly doesn't Illuminate the entire surface of the dish. Even though the scalar ring I'm apparently using is not designed for ku-band reception, it still gives me a slight marginal gain. That's where the feed horn I'm looking for becomes handy. I except the gain to be very significant.