A choice of 406/121.5MHz antennas is available to suit any sub-sonic aircraft. For most GA applications, the AV200 whip antenna is the logical choice, combining high performance with entry-level pricing. Most helicopters will be better suited to the AV300 rod antenna, as will aircraft with a VNE in excess of 250 knots. For all aircraft with a VNE in excess of 350 knots we recommend the ANT500 blade antenna. The Kannad Integra ELT has a built-in 406MHz antenna. Provided the unit is mounted in a position where it can see at least a part of the sky, either in a glassfibre fuselage or under a canopy, an external 406MHz antenna should not be needed, though national regulations may still require one to be fitted. Check with your installer for the rules in your country.