My aerial was just long enough to fit to the tv so to lengthen it.. I cut it right back to near where it enters the room through the wall / window area and fittted a plug to it. I have new aerial cable which I’ve cut to desired length and fitted a plug to either end of that. Then connecting both using a connector. But there’s now no signal!!! Any help would be appreciated.
You don't need to solder the center wire, And even if the outside braid touches the center wire you would still get some sort of signal.
To get no signal at all would seem to be impossible if the cable did connect to the TV Before and you had a signal. Take it you are using the normal Coax cable meant for a TV aerial.
Don't follow you, ""Then connecting both using a connector. But there’s now no signal" I take it you used a female connector plug to the Cable at the window connected the new cable and then plugged the other end on to the TV.