Ch 8 is a VHF signal, but your antenna is optimized for UHF. So on the best of days, it may bring it in for you. However, if you added a VHF only antenna and joined them using a UHF/VHF combiner, that'd probably fix you up. That'd mean any other VHF would be tuned in w/the new antenna.
That doesn't speak to the issue with Ch 4 (real 36) - it's UHF. I'd guess aiming the antenna a bit more south would improve signal there. You said the antenna is on the SW side, so I'd assume it's facing that direction? The screen on the back of the antenna is the reflector. If you remove it, the antenna picks up more from behind but less from the front. Sometimes, that's a solution when there's signals all around. Since it's a 4-bay, I would if you were to just snip of enough for two, if that'd help you get a bit of both scenarios. I'm only speculating and not suggesting that you go modding your antenna. If it unbolts, you could try removing it as a test.
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