For the General Aviation sector, the most popular ELT's are the 406 AF Compact Pack and the new Integra 406 AF Pack (The Integra units also transmit GPS location data and have internal antennas) although you should also purchase an external antenna for your aircraft. For these two ELT's, most command aircraft antenna's are either the Kannad AV200 antenna which is suitable for speeds up to 250 knots or the Kannad AV300 for speeds up to 350 knots. Blade type antennas are available for aircraft with higher operating speeds. Please refer to the antenna technical pdf's available for specific details of technical specifications and fixing options. Auxiliary antennas are also available for attachment directly to the ELT when the beacon is being used as a survival PLB.