Most antenna patterns are plotted at the 3dB roll off. While this is logarithmic, it's also "half power". https://electronics.stackexchange.com/questions/6959/

Most antenna patterns are plotted at the 3dB roll off. While this is logarithmic, it's also "half power". https://electronics.stackexchange.com/questions/6959/what-is-the-significance-of-3db https://electronics.stackexchange.com/questions/6959/what-is...