The number of channels you may have available on an outdoor TV antenna is not an exact science. Since a lot of the number of frequencies and the quality of the signal received depends greatly on the angle with which the antenna is pointed at, the location of the antenna and the type of antenna that is installed. Metropolitan areas have a lot more signals going through especially the UHF kind. A good UHF antenna can pick up anywhere between 70-100 channels on average. The Los Angeles metropolitan area can pick up more than 147 channels that stream in full HD resolution. VHF signals are increasingly less common as more and more channels opt out of using the lower frequency. However, a well-angled antenna can detect 40=60 VHF channels in a city area. Most modern antennas can pick up both VHF and UHF signals and if you live a city or a well-populated area you could expect anywhere between 110-160 channels and a well-angled antenna could have you stream all of them in HD and even some in 2160p 4K resolution.