An antenna booster is a device that helps to address poor cellphone reception by amplifying a weak signal and bypassing obstructions to ensure strong network signal. It is helpful to place the antenna outside, such as on the roof, where there is network connectivity.
The outside antenna connects to a signal amplifier inside the house. The amplifier expands the signal and sends it to the inside antenna, which sends the signal to the area with low network connectivity. Antenna boosters for cellphones come in different designs and strengths. Choosing the right booster involves knowing the existing strength of carriers and the size of the area with poor reception.