Think it all depends on the make/model of the receiver. Have them email you a picture of the dish with a tape measure held horizontal across the dish? No way, as I see it, is it 40 inches across. (Nice lookin dish but no clue as to make) (But for the 'right' price I'd put it in the 'stable') Think that LNBF isn't worth anything as its 'F' connector is pointed up and I see moisture in the background (snow).
Shoot for 1/2 the price of new? Go from there? - Be Rick of Pawn Shop, or Mike of American Pickers.