Ameri-King AK-451-ELT - Manual (Page 46)

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2.2.2.2.4 Integral Antenna Installation: (AK 451.017-4(S))
The integral Antenna AK 451.017-4(S) is fastened to the ELT-(AP) with Integral
Antenna, ELT-(S). This Antenna required no ground plane. The antenna ground
plane installation is not required.
Type of aircraft:
The AK 451.017-4(S) Integral Antenna is designed for installation for any aircraft
including fix wing and helicopters.
Installation:
Installation is not required.
The AK-451 (AP) with Integral Antenna and AK-451-(S) are the best ELT
configurations for composite aircraft because the Antenna ground plane is not
required.