Wilson Electronics Trucker Spring-Mount Antenna with 13.5 - Feet Rg58 Cable and Sma Male Connector - Retail Packaging - Black Designed Specifically For Use With Rvs, Trailers, Campers & Other Nonmetallic-bodied Vehicles Most Powerful High-gain Cellular Antenna By Wilson Accommodates 4g Frequencies Built-in Spring Reduces Impact Damage Antenna Height: 21.5"