Cable reception not clear on some channels

rbp111 wrote:
I have a 3 year old fifth-wheel trailer. I have noticed that the reception on the television, that is when I have cable, varies quite a bit. The channels, say 2-10, are ok, a little bit fuzzy, but I can see it. The next channels, say 11 - 20 are hard to see as they don't come in clear at all. They are almost unrecognizable. the remaining channels are crystal clear.
I have checked the cable, replaced the external one 3 times. I have checked the connections on both ends and they seem to be ok.
Is it the cable inside the trailer? Why would it give different quality of the tv?

Is the antenna amplifier turned off? Is the television set to "Cable". The suggestion of running a direct cable would be my next check. And if all that fails, it is probably the tuner in the television.