I am here:-flash
I have been lucky enuf to try loads of diffrent type's of lnb's on andew / channel master dishes from 60 cm up to 4.9m over the last 10 year's and one thing i have learned is don't listen to what LNB companys put on there lnb's i have seen high qulity 0.9db lnb's wipe the floor with so called 0.2db lnb's,
As for useing a feedhorn you should always use a feedhorn matched to the spec of the dish this matters more as the bigger the dish get's E.G a 2.4m andrew's will act as a 2.0m dish with out the correct feedhorn,
Last summer i had a load of lnbs 40mm lnb-f's and c120's what i found is that without the feedhorn and c120 you loose about 1.5DB of the gain of the dish with out it,
It is up to you if you want to use the feedhorn with a c120 lnb you just need to look at what you will be useing this dish for if its just going to be on astra or eutelsat 13'e or hispasat etc Just put a 40mm LNB-F on it but if you want to pick up weak satellites and get the most out of the dish and have the cash to spare get a c-120 lnb,
Best make lnbs are inverto, invacom, mti, cal amp, norsat, s microwave, cambridge, sharp, etc
I use a inverto c120 myself it works well better than those over priced invacoms i dont know why people bang on about them, The best 40mm lnb-f i have used is the sharp one
here you go check these item numbers on ebay
inverto / 170031665078
Sharp 0.3 / 220007891326
Also good sharp 0.6 / 220007892515
