Buzzing using AV sender



I am using a cheap video sender (Tristar from Argos) to transmit Sky pictures from downstairs to a second TV in the bedroom. Picture quality is OK, but there is an annoying buzz when viewing menus or whenever text comes on the screen, e.g. message telling you to press the red button for interactive. Also there is interference with both sound and vision if you move close to the receiver unit.

OK I know you get what you pay for, but does anyone know what causes this?

Can I do anything about it?

Would it be any better with a more expensive unit? I don't want to splash out only to find things are much the same.

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