Keeping the original feedhorn would give you the advantage of having the feed that is specifically "tuned" for the dish, but I know from experience that a plain LNBF will work well on this dish. For some time, I had the Fortec FSKUV-1 universal LNBF on my 1 meter Channel Master, and it worked. My dish originally came with no feedhorn or LNB, but I was later able to find the proper feedhorn on EBay. Keeping the original feed is particularly important with the elliptical Channel Masters (the "e" series)...