So after reading up on all the available information out there would I be correct in thinking that if I;
1. Got a twisted pair RJ11 short cable and replaced the HH5 one that might improve it?
2. Get an RJ45 to RJ11 cable and replace the HH5 cable that might improve it?
3.As far as shielding from radio/electrical interference, would using something like foil around the RJ11 cable reduce the interfence felt on the cable itself?
4. Also as far as electrical interference, if I'm right in thinking most of this seems to come from the electrical circuits of the house. So if its an unstable house electric network then this might cause some interference with the router. So if I was to buy a good UPS device and plug the router in to that then surely it wouldnt matter what else was connected to the plugs in the house my RJ11 and modem would be working perfectly?
Also a question, my current RJ11, because of my other phone splitters plugged in at the master socket, the cable is sort of twisted a little bit. Will this make a difference on that RJ11 cable signal quality as I've heard that the RJ11's BT sends out is the bog standard untwisted pair?