Hello, After way too many side-quests, I've finally managed to measure the frequency response curves of the 2 top sector antenna candidates. The measurements were made using a higher precision technique than originally published for antenna frequency response measurement. The software to help the measurements has also been updated. The improved precision technique is in the last section of the Antenna Analysis page: https://www.hamwan.org/t/tiki-index.php?page=Antenna+Analysis&structure=HamW... The ARC ARC-VS5818SD1 sector antenna FR curve is linked at the top of the above page, but can be directly viewed here: https://www.hamwan.org/t/tiki-index.php?page=ARC+ARC-VS5818SD1&structure=Ham... The Laird SAH58-120-16-WB sector antenna FR curve is also linked at the top of the Antenna Analysis page, but here you go: https://www.hamwan.org/t/tiki-index.php?page=Laird+SAH58-120-16-WB&structure... The figure of merit in these tests is low variability. A constant gain across the whole spectrum is ideal. Next up, I need to build an antenna rotor system and do radiation pattern measurements. This is gonna be tough. Anybody wanna donate an AZ/EL rotor? Or any decent computer-controlled rotor? --Bart