When reading a radiation pattern for an antenna, at which two drops in signal and power is the beam width measured? (Choose two.)

When reading a radiation pattern for an antenna, at which two drops in signal and power is the beam width measured? (Choose two.)
A . 3 dB
B . 6 dB
C . 9 dB
D . 10 dB
E . 1/2 power
F . 1/4 power
G . 1/8 power
H . 1/10 power

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Answer: A, E