Well, first off, It would be possible for these to "improve" reception. But I would doubt they could improve transmitting. They're passive antennas....sort of like the ones you can get for you car. They may actually help, but the problem is that there's no place I can think of it would be conceivable to use them. They may actually intercept MORE interference... The other side is that once you get away from a tower, they don't really boost your signal back to the tower. That could only be done with having a lot more wire in your antenna...but then you'd need more current to make use of an antenna of that size. So...save the stamp for mailing your cellphone bill.