NR770HBNMO Original Diamond Antenna Dual Band Mobile Antenna 2m/70cm Mobile Antenna with NMO Connector and Fold Over Hinge, 40" Tall, BLACK 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!