While the Sensar Pro is a good add-on, it's certainly not necessary and not the end all device for OTA TV. I have been in locations where the antenna stowed works better than the antenna up and locations where no matter where you point the antenna the reception is either excellent or terrible. You first need to know which way your antenna is pointing and if you do then using any number of online apps will also get your antenna pointed in the correct direction. Also keep in mind that having the antenna pointed in the correct direction is not always necessary for excellent OTA TV reception.