Location, location, location.
We live in Guerneville on the river and can't get any TV with a rooftop antenna, even raised 20' above the roof, because there's a hilltops between us and the TV stations--and most stations are far away.. But if you're in a better location, it's worth investigating. You can start with rabbit ears or a coat hanger for starters.
www.antennaweb.org/ has a great tool that will tell you what stations you are likely to receive. I t correctly shows 0 station for my address. For Graton Rd at Hwy 116, it shows 8 stations and 13 channels (many stations broadcast multiple channels).
www.solidsignal.com and
https://www.antennasdirect.com are also good resources.