I see these sticks on the back of almost all trucks in my area, what are they?

If you have ever driven through rural highways, mountain roads, or remote delivery routes and watched your phone signal drop to almost nothing, the product in these images is designed to solve exactly that problem. It is called the HiBoost Travel 3.0 Truck Cell Booster, a vehicle cell phone signal booster made for SUVs, trucks, and semi-trucks. According to HiBoost, it works with all major U.S. carriers, supports multiple users, is 5G compatible, and delivers up to 50 dB max gain.
In simple terms, this device does not create signal from nowhere. Instead, it takes an existing weak outside cellular signal, amplifies it, and rebroadcasts it inside the vehicle. The system shown in the product photos includes an outside antenna, a booster unit, and an inside antenna. HiBoost explains the process in three steps: the exterior antenna captures signal from the nearest cell tower, the booster strengthens it, and the interior antenna spreads that stronger signal through the truck cabin.

The main use of this product is to improve calls, texts, mobile data, streaming, and hotspot performance while driving in places where signal is weak. That makes it especially useful for long-haul truckers, fleet vehicles, highway travel, off-road driving, and rural transportation routes. HiBoost says the Travel 3.0 Truck model is optimized for use on highways and in low-signal areas such as mountain passes, remote roads, and rural delivery zones.
One of the biggest selling points is its upgraded outside antenna. The product description says it uses a high-powered amplifier and a rugged exterior antenna, while the official page adds that the outdoor antenna includes two extension poles so drivers can adjust height for a stronger signal. The booster housing is also described as shock-resistant, durable, and built for rough use, which is why it is marketed as a good match for trucks and semis that spend long hours on the road.
Another important detail is compatibility. This booster is designed to support 3G, 4G LTE, and 5G low-band networks used by U.S. carriers. The visible specs list support for Band 12, Band 13, Band 5, Band 25-2, and Band 4, and HiBoost says it works with AT&T, Verizon, T-Mobile, and U.S. Cellular. That means the booster is intended to help a wide range of phones rather than just one brand or one carrier.

As for when it came out, this is clearly a modern Travel 3.0-generation product from HiBoost’s current vehicle lineup, and the company describes that generation as its latest version. I did not find a precise original launch year stated in the visible official product details, so the safest description is that it is a recent 5G-era truck booster, not an older legacy model.
Overall, the HiBoost Travel 3.0 Truck Cell Booster is best understood as a practical road tool for people who rely on their phones while traveling. For American drivers, especially those in trucks, SUVs, and semi-trucks, its purpose is straightforward: fewer dropped calls, more stable data, and better signal inside the vehicle when outside coverage is weak.