With respect to IEEE 802.11 wireless networking and for antennas, the beam width is the angle of measurement of the main RF lobe and is measured at .

With respect to IEEE 802.11 wireless networking and for antennas, the beam width is the angle of measurement of the main RF lobe and is measured at -3dB.

Explanation:

To attain the maximum radiation of the antenna an angle with main lobe called beam width. This angle can be varied to attain the maximum power of radiation and distance of transmission from antenna. With the help of beam width we can vary the strength of signal at different positions. It also varies the signal to noise ratio.

according to IEEE 802.11 wireless networking and antennas beam width will be measured at -3dB to achieve the maximum gain of the antenna.

answer inspecting packets in isolation from their context;