Hello, I'm about to start measuring the vertical radiation patterns of the sector antennas here. But before I start that exercise, I thought it'd be good to understand the vertical radiation requirements first! To this end, I've updated the Radio Frequency Engineering <https://www.hamwan.org/t/tiki-index.php?page=Radio+Frequency+Engineering&structure=HamWAN> page with a semi-bogus example (does not account for ground elevation at the client side) between Cougar Mtn and Paine Field. From the example, I also outlined a procedure for sector alignment to achieve the correct radiation pattern in the real world. Any comments or suggestions for improvement? Seeing the actual geometry is kind of startling. I think it'd be helpful to translate and import the actual sector antenna radiation pattern readings being done in the lab to Radio Mobile .ant files and simulate coverage based on real topographical data. Anyone feel like writing the conversion software, or is familiar with .ant file format? I don't think it's possible to feed it 3D radiation patterns, but at least AZ/EL single polar scans should give something useful. --Bart