First off, I did try looking but couldn't find the answer I was looking for or maybe I did but wasn't unsure of it.

I have a Sony Bravia (KDL-40V2500) and today I just found out that over-the-air broadcast (like FOX, UPN, ABC, etc) has sub-channels and also better quality than what I've been looking at this whole time. I tried reading the manual, tried googling around, but I am still not sure how I get this subchannels with better quality, using the antenna (the person that showed me the better quality subchannels doesn't have cable/satelite/fios tv, just antenna).

The antenna I'm currently using is the one that came with ATi's TV Wonder USB device, does that make a difference in why I'm not getting the subchannels or channels in better quality?

Basically hook up the antenna and do a scan, you should see your primary channels as xx-1 then any sub channels each of those has as xx-2, xx-3 and so on. If you need help with programming your TV, try the proper forum under Display Devices for your TV type. If you'd like antenna help, post your tvfool.com results here for digital only and we can make some suggestions on what you need for reception of OTA digital.