DIAMOND Antenna 146/446 MHz Mini Dual-Band Mobile Antenna w/ Mini Magnet Mount & Cable RG-58/U Length Approx. 13ft , Black, Gain: 2.15 / 3.4 dBi, Connector: PL-259, Antenna Length: 20", Max Watts: 70, Magnet Diameter 2.6" UHF Connector. Diamond Antenna Dual-Band Mobile Antennas are a great combination of price, quality, and versatility! You can find the exact combination of features you want to suit any dual-band mobile antenna need. Generally speaking, the higher you want the gain to be, the taller the antenna will be. Taller antennas may not be suitable for magnetic mount, so other mounting options are available. Shorter antennas are more convenient but will generally have lower gain. Antennas with the 'fold-over' feature offer yet another solution! All mobile antennas represent some sort of compromise. The diversity of styles and features offered by these dual-band mobile antennas allow you to choose what the compromises will be. You may make choices of gain, size, mounting, power rating, connectivity, price, and even color! With so many choices available, your problem won't be finding a suitable antenna; it will be finding just one!