My cable signal has been marginal for a long time. With analog tuners, the signal is usable but not great. The HD channels on my TV tuner as well on the STB sometimes break up, especially when it rains. Now, I have a Ceton InfiniTV, but the signal is too weak for it to get a full lock. I've plugged it into the cable directly without any splitters, etc. with no luck. I've put it downstream of an amplifier, which helps, but it's still too weak to lock. Is it possible to get my signal boosted?