That's all i could find too and standard def doesn't get me too excited to make that investment. Have read mixed thoughts on manual alignment.
I have the Windgard dome with DirecTV and a 42 inch tv. It does stink that only in SD but it does its job well and should be clearer on a 24 inch tv. I also have an antenna that I got from Best buy and paid about $100 for thinking it would be really good getting HD signals but only seems to bring in Fox and sometimes KCCI (no ABC) so limited on games you can pull in.