Truck

Cellular signal booster or amplifier kits consist of 3 main parts - Exterior antenna, signal amplifier, and interior antenna:
An exterior trucking roof antenna transmits signals from nearest cell towers into the vehicle cabin via coax cable.
The mobile signal amplifier amplifies or repeats those signals to multiply them many times over and then transmit them to truck's interior antenna via coax cable provided.
Finally, that inside antenna distributes the strong wireless signals within interior of truck to enhance cellphone reception considerably to enable fast 3G, 4G LTE, 5GE Internet and clear mobile phone conversations.

Mobile cell phone boosters work in a similar way: the outdoor antenna attaches magnetically to your vehicle’s surface, usually on the roof. It receives and sends cell signals to the booster, which is placed inside the vehicle, usually under a seat. An internal antenna located inside the vehicle broadcasts the boosted signal to provide enhanced cell coverage within the cabin. HiBoost offers vehicle cell phone boosters for cars, SUVs, trucks, and RVs.