I hope that I have asked this question in the right topic.

Basically I use BT (In the U.K.) and I have problems with my router receiving a strong signal in certain rooms of the house, which, therefore makes the internet really slow in some cases it won't work at all.

I have had experience working with Virgin Media (UK) before and just changed the channel number and this worked fine, but, do not know if I would receive the same outcome on BT.

Could anyone suggest any other things that I could try alongside of the channel change in order to /hopefully/ get a stronger signal, without having to install Ethernet cable?