Adding higher gain antennas without decreasing transmit power is a common way for people to exceed authorized transmit power. The regulatory theory was that by

Adding higher gain antennas without decreasing transmit power is a common way for people to exceed authorized transmit power. The regulatory theory was that by using a "uncommon" connector only people who know to decrease transmit power (the "professional installer") would be changing antennas: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?id=29031&switch=P https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm...