I recently went wireless following sound advice on this very forum. Whilst everyone's situation will be different the signals that fly back and forth between my router and receiver are, according to the diagnostics, excellent. This despite passing through several layers of plasterboard. It probably helps that the wireless adaptor on PC no. 2 is a USB device as this allows the aerial to be moved around but I would guess that your house would have to be made of lead to prevent a decent signal getting through.