RES418 – 319 – 4 For the protection of the aeronautical mobile (R) service (AM(R)S) in the frequency band 5 091-5 150 MHz, the maximum pfd produced at the surface of the Earth, where AM(R)S may be deployed in accordance with No. 5.444B,by emissions from an aircraft station of an aeronautical mobile service system, limited to transmissions of telemetry for flight testing, shall not exceed: −89.4 dB(W/(m2 20 MHz)) − Gr (θ). Gr (θ) represents the mobile service receiver antenna gain versus elevation angle θ and is defined as follows: Gr ()max G1(),G2() 2 1 27 12 6 )(G .1 0.7 27 ()6 10 log max 1.5 G2 where: G(θ) : gain relative to an isotropic antenna (dBi) (θ) :absolute value of the elevation angle relative to the angle of maximum gain (degrees).