Hey Brian,
That is a good howler! I have a modified version of that call, from Rich Higgins. He uses the mouth piece and attaches it to a cow horn, then adds some cool metal accents in the shape of a sunburst and coyote head. I will try to post up a picture.
Ed steered you to a great site with lots of info. Search on howling and you will come up with a ton of info. There area bunch of good videos out that show some howling.
Right now coyotes are beginning to pair up to mate. I think the best two howls you can use now are the yip-howl for locating and the lone howl for calling them in. The lone howl used in conjuction with a distress call works well...especially in areas where there is calling pressure and guys do not normally howl.
Search that site and you will find TONS of info...good luck!