Keith,
I went out to the dish today, had planned on re-mounting the lnb a little better. While I had it off I pulled the cover and looked inside. It is indeed a circular lnb from the ground up, not a linear with a hunk of plastic the dealer shoved in there. It has a square wave guide with a ribbed metal divider that starts low then gradually steps up to full width. There are two probes at the back, one on each side of the divider, they both point straight up in the same direction. This construction is similar to what I have seen inside other Dish Network lnbs. Made of heavy cast, I'd say this is a well built $28 lnb.