If your stations are "yellow" on antennaweb, try the Philips/Zenith Silver Sensor HDTV1 for UHF - if you have VHF as well, the Terk HDTVi is a clone of the Silver Sensor but with "rabbit ears" for VHF. Make sure you try the unamplified versions.
Just like for indoor antennas, if an outside antenna does not look like an antenna it is almost certainly an underperformer for the price. Antenna physics is the same now as it was 50 years ago. The CM4228 which is one of the two best-performing UHF antennas has been around for a very long time.So things that look like dishes, saucers, electric heaters and so on should be avoided!