I'm in a poor (1 bar) signal area.  We have a landline to overcome this,  Moving to full fibre broadband shortly and will lose landline.

What's the best way of boosting my signal indoors.   I've looked for products but they focus on boosting signal to a 4G router and then giving mifi.

What I believe I need is an external aerial to a 4G booster transmitter that's located indoors.  Any assistance/recommended products would be appreciated.