That antenna was probably intended for UHF broadcast frequencies (can be smaller). It's encouraging that you get that many channels on a indoor antenna. VHF reception (CBS/KTHV is on VHF RF 12 and PBS/KETS is on RF 7) will probably require a larger combination VHF/UHF antenna. You would probably need to put it outside or in the attic. I did a tvfool.com report for the intersection of Hickory Bend Dr. and Greystone Blvd.:
Click the above link to see it. You can also go to TVFool.com and generate a report that is more accurate for your exact location. Your reception and therefore the size antenna you would need could depend on whether you are north or south of that east-west running ridge that goes thru Greystone. Antenna size will also depend on whether there are trees close and to your South/Southwest.
Anyway, there is a legend at the bottom of the report which relates channel background color to the type antenna you may need. It appears that you may need an antenna in the attic or, if possible, an outside antenna for best results. It needs to receive both VHF and UHF frequencies. You can probably point a sufficiently large directional (not omnidirectional) antenna to the South or Southwest and get the channels you want.
If you post a link to a tvfool.com report like the one above for your exact location we can probably give better advice. That link can be copied and pasted from near the top of the report where it says:
If you would like to share these results with others, this page can be referenced as:
Hopefully, someone in a similar situation to yours can recommend specific antennas for around 30-40 miles from the transmitters.
Edit: BTW, what appears to be your strongest signal, KTWN, is no longer operating so don't expect to get it.
Just for fun you might try putting the antenna you already have outside a south-facing window just to see what you can get. If you do this don't forget to rescan the channels on your TV. It also helps if you have a signal meter on your TV so that you can use it to help adjust the antenna for best performance.
Hope this helps,