Understanding Beamwidth

[tomander]

I am trying to understand the information for beamwidth that is listed for some antennas. If an antenna has a listed beamwidth of say 30 degrees, does this mean if the antenna is pointed due north it would receive TV signals from 330 to 30 degrees? Or does it mean the antenna would recieve singals from 345 to 15 degrees?

Thanks Tom

 

[QCK]

It would be 345 to 15 degrees understanding the definition below:

Antenna beamwidth, also known as the half-power beamwidth, is the angle of an antenna pattern or beam over which the relative power is at or above 50% of the peak power.