Looking at the TVFool.com report for Monterey, CA, I see that channel 8 is at about 64°, and some channels are at 105°-ish; that's only about 45°, and pretty much any antenna will do adequately, pointed straight down the middle.
Since you need ch8, you probably need a VHF-Hi+UHF combo antenna, something along the lines of an Antennacraft HBU-22 or an Antennas Direct V10. You may be little too far out for me to try my luck with a UHF-only antenna. Antennas Direct, Winegard, and Channel Master all make excellent antennas for VHF-Hi (ch7-13), but the Antennacraft HBU-22 is a great starter antenna, and cheap enough that you don't mind upgrading later if it doesn't work out. Worst case, you could get a rotator. If you absolutely have to have both sets of towers, and absolutely cannot use a rotator, you could go with an HBU-22 pointed at 64° and an Antennacraft U4000 (4-bay UHF-only) on a separate mast, pointing at 105°. The U4000 has a very broad "beam width," and will certainly catch all UHF stations if pointed down the middle, and has a much higher gain figure than the combos that are available.
If I were to start from scratch, I'd buy a U4000 first, put it up, and just see what happens. A lot of people find that the U4000 does collect enough VHF radiation to make for watchable TV, but they're usually closer to the source. Then add another mast with an HBU-22 later, if the U4000 just isn't good enough.
If you get a U4000, it works with ALL UHF channels with no rotator, but ch8 still doesn't come in, you could get a dedicated VHF antenna like the Antennacraft Y5-7-13, point it directly at 64°, and split 64-105° with the U4000, joined with a UVSJ antenna combiner; that's actually the most elegant option, and the second-to-cheapest. The cheapest would be if you could get away with the HBU-22 with no rotator...
