Well you did mention "Oxymoron".
"Small and HD are not exactly compatible.
Small: Winegard sells a small single/Solo LNB dish that is designed to sit upon a table top or the like.. Very small. but.. Can do DirecTV (but not DirecHDTV) and can do dish (HD or not) But only one satellite at a time, Both Dish and DirecHD use 3.
Some DOME type antennas can roof mount (Others ground/table mount) and can do all 3 satellites for Dishnetwork, but only one at a time, so if all you have is a single VIP-211 receiver.. Fanstastic, but if you have a dual-channel DVR or multiple receivers.. Not so much.
NO dome can do DirecHD
Ground mount (Full size) dishes.. Do all the above, single or multiple receivers, no problem but they are bigger.