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Why a repeater will not work in a vehicle
A repeater for use in a vehicle, whether it is a car, truck, boat or motorhome cannot increase range because it is not possible to attenuate (separate) the internal antenna signal from the external signal enough to avoid oscillation. It is known by anyone that has ever used a cell phone that the phone itself can send and receive signals to and from a tower as far away as 10 miles or more under the right conditions without the aid of a booster or external antenna. It stands to reason, and proven under test, that a signal that can travel this distance through the air can and will reach any repeater antenna that is located on the outside of the vehicle while simultaneously being received by the the antenna on the inside of the vehicle. This will cause an oscillation (feedback) and may burn out the repeater but at the very least the oscillation will cause "RF noise" that will be transmitted by the repeater to the tower and to the cell phone on the same channel that is being used by the cell phone making the call and this will result in the failure of the originating phone call. This condition will occur when the phone is far away from the tower and the tower commands the phone to transmit at a high level. This is also the time that signal amplification will be required because the phone is going out of range.
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