bigger than SuperDish = better
The HughesNet dish is 36" wide, so it should have a horizontal beamwidth similar to a 36" round.
The feedhorn should be oval (taller than wide) and illuminate the dish optimally.
Using a round feed LNBF on the dish, would throw away performance.
Other users have posted pix of that and similar dishes.
Look 'em up (or factory assembly drawings), assemble the LNB & feedhorn in the proper place, pull off the transmitter & tube, plug the hole, choose 10750 for LO, and be on your way.
Nice work with your SuperDish, too!
Edit: I think your LNB voltage switches between V & H polarity, but you should verify that.
On similar setups, a single-polarity LNB is fitted.
The thing with 100 screws between the LNB and the feedhorn, is a diplexer.
It keeps the transmit signal out of the receiving LNB.
It may work in one or more of the following ways:
- frequency selective, acting as a filter
- polarity selective, H for xmit, V for rcv (or vice versa)
- directional coupler (xmit port goes only to feedhorn / feed horn only goes to the LNB
So, without knowing more, I couldn't guess if the current LNB will get both polarities.
If you have to change the LNB, be sure to keep the feedhorn.