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Short Explanation of what multipath is below. Based on what info you have provided I would lean towards a multipath issues. Looks like your TV Tuner does a better job at handling it than the 622.
Here is something you can do. There is a way to add a channel manually with the 622. (Add Channel). You can use that screen and provide the frequency of your strongest channel. Then move the antenna around slowly and see if you pick up anything. It is possible that by moving it to another direction you might lock on.
If that does not work.. The next thing I would try is an antenna designed to be more multi path resistant.
http://en.wikipedia.org/wiki/Multipath
Here is something you can do. There is a way to add a channel manually with the 622. (Add Channel). You can use that screen and provide the frequency of your strongest channel. Then move the antenna around slowly and see if you pick up anything. It is possible that by moving it to another direction you might lock on.
If that does not work.. The next thing I would try is an antenna designed to be more multi path resistant.
http://en.wikipedia.org/wiki/Multipath
