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This question already has an answer here:

Can two identical yagi antennas be linked together to improve a cell phone signal?

The idea is to put one antenna on the rooftop and the other in the house, and connect the two with feedline but no amplifier. If the rooftop antenna is pointed to the tower and you use the cell phone while in front of the antenna that is in the house, will this provide a signal advantage for duplex and solve the common problem of low signal strength in a house?

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marked as duplicate by a CVn, Kevin Reid AG6YO Jul 25 '16 at 20:06

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ My cell phone contract is with AT&T. A number of years ago, actually I think prior to AT&T purchase by Cingular, my cell service at my home was very poor. I complained. They had an antenna that they could install in my home to enhance signal sensitivity (RX and TX). I asked to get such an antenna. But, instead of calling me back to arrange for the installation, I received notice of a new cell tower being installed that was supposed to improve service in my area. I waited and the new tower fixed the problem. So, they do have devices that provide for the kind of solution you seem to need. $\endgroup$ – K7PEH Jul 25 '16 at 2:09
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    $\begingroup$ What you are asking about is known as a passive repeater. They can work, under some rather special circumstances, but unless the two antennas are essentially back-to-back you need serious gain in order to overcome the feedline losses. They are mostly useful when you might normally rely on signal reflection but for some reason the signal simply isn't reflected to where you want it and you can't fix that by, say, adding an appropriate RF reflector. $\endgroup$ – a CVn Jul 25 '16 at 19:08