The cell phone external antenna is external an amplifier / repeater for cell phone reception. It has been shown to improve RF coverage for areas with low signal strength -- or no signal strength. It is typically used inside an office building / warehouse / home / vehicle.

When your cell phone receives a signal, the signal is received by the outside antenna from the cell site. The signal is sent to the amplifier / repeater, where is then amplified / repeated, and afterwards the signal is transmitted to your phone through the inside antenna.

When your cell phone transmits a signal, it transmits the signal to the inside antenna, the inside antenna beinng in turn connected to the amplifier / repeater. The signal is then amplified / repeated and then transmitted to the outside antenna. From there the signal is sent to the cell site, and then to the wireless phone of who you are talking to.

Popular repeater antennas for enhanced cell phone signal reception are:

Enhances reception for portable cellular phones. The passive repeater antenna 'enhances' a phone's signal reception only. It is universal and totally wireless, works on all phones. Reduces drop calls, static noise and "No Service" conditions. Simple to install - mounts on rear windows. No cable hookup required.

Universal 1 dbi short (less than 5 inches) external repeater antenna for the car. The passive repeater antenna 'enhances' a phone's signal reception only. Helps with lost signals when inside the car, now get fewer droped calls with this product. It is wirelesss and works on all phones.

The passive repeater antenna 'enhances' a phone's signal reception onyl. Helps with lost signals when inside the car, now get fewer droped calls with this product. It is wireless and works on all phones.