Hi i need advice on my tv ariel/signal?!x x x?

You might need to retune the TV, we have a loft aerial and the channels are on different frequencies to the one on the roof. Look in the TVs manual and it should give instructions on how to autotune the TV to find all the channels at the best frequency. If it's still crap, then you may as well get a signal splitter and plug this into the socket downstairs and run one cable into the downstairs TV and the other cable up to the bedroom TV so that they both use the roof aerial.