I need to make an indoor repeater for a small household to improve mobile signal coverage. Does anybody have a circuit on this? And how do I choose the frequency from the range of frequencies for the Yagi antenna?

Please, if anyone can help, please do.!

 

You must design and build a transmitter that shifts frequencies and operates at many microwave frequencies. That is illegal.

Then you must design and build a receiver that is not overloaded.

When you design the circuit then please post it here.