Not crazy at all. It might well be too faint for SC to lock onto. Your scanner would have no less of a problem for the same reason. Do you have any closer sites to you?
I'm not familiar with OKWin, but are the talkgroups you are trying to use limited to just a few towers, or are they simulcast across the entire network? If they are limited in coverage, you must be able to hear those towers, or you won't be able to hear them
Mike