The OTA antenna switch is often incorrectly referred to as a "Booster"... it is not a booster... what it actually does is supplies 12 volts DC to the antenna head amplifier that is an "Active" electronic part that needs power to work...
IF your OTA TV signals drop when switch is ON and the antenna is in Active instead of passive mode then most likely you have an issue up top with the antenna preamp...
This link has the manual for the Sensar III antenna head and how to troubleshoot your issue....
https://winegard.com/industry/recrea...t-antenna-head