The problem with a Omnidirectional antenna is that it is also very susceptible to multipath. Sometimes - too much signal, coming from different directions at the same time - stepping all over each other is just as bad as a weak signal or no signal at all.
You have signals coming from the North east to the South and everywhere in between.
There ought to be a lot of gettable signals with the right antenna.
Sorry for the multiple posts, but I needed to burn up 3 posts before I could post a URL.
TV Fool