From the SolidSignal web site about the DB8 - This is a Large Multi-directional antenna and yields a beam width of about 100 degrees. So it appears that it would pick up the stations from SF and SC but not at the same time. Unless there is a way to adjust that, but not much info on the site.
Most directional antennaes have a beam width of around 20 degrees, I believe. So this multi-directional antenna can pick up stations within a 100 degree arc, but if you want to get SF and SC - those stations are about 175 degrees opposite each other. Tougher to do with a single antenna. Just getting two $25 Radio Shack UHF antennaes may be a cheaper solution. RS claims them to have a range of 75 miles. The ChannelMaster CM3000A on the SolidSignal site is a 360 degree antenna but has a limited range.
I am by no means an expert, just some one who has purchased many, many different antenna types, but nothing like what you are considering. I have Fox in the opposite direction of my other stations and ended up with a two antenna solution.
The other consideration is that once the analog signals are shut off, all the stations are going to go back to their assigned frequencies, only digital. So a UHF only antenna will not pick up your SC 4 and 9 or the SF 11 or 13. This may no longer be true, but was my understanding at one time.