Pattern Generators

[site123a]

I'm thinking about buying a TV pattern generator on you know where, but I wanted to know if there is any particular one I should get.

Here is one I'm looking at right now:
http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

I know that this model is made for direct signal injection, but couldn't I get an adapter so I can use it with RCA & coax jacks?

I just need a pattern generator for calibration purposes and quick receiver testing. So I'm open for suggestions...