There is absolutely no way that $25 antenna can get signals from 150 miles away or the full range of VHF & UHF signals. If you want to find out what you CAN get with a
good antenna, go to
TVfool.com, enter your location and see what is available. There are no industry standards for testing and listing of how far away antennas can get a signal and distances are often inflated. Some signals will be line of sight and long distance will be reflected off the atmosphere. The problem with a roof mounted RV antenna is that they need to be able to withstand high wind speeds from road travel and in some areas, heavy snow loads. I agree Winegard is behind on antennas for today's RV-ers. Just about anything larger than the Sensar IV should be better.
The Winegard Sensar IV is about as you can get for an antenna on the roof of an RV. To do better than that, you'll want a yagi style antenna that is wider and has a longer boom or a bowtie array style. Getting it higher should help but not always. A basic/compact yagi style antenna would be something like the popular Winegard HD7000R in 1st pic and is listed as good for 30 miles. RCA and one or two others make a similar one. An example of an antenna designed for long range would be something like the Winegard HD8200U in 2nd pic which is listed as good for up to 65 miles, but it's huge at 14' long by over 9' wide. If you want to see what's available in OTA TV antennas,
Solid Signal has a good listing of the various brands and types.
I've been looking at getting something better than our Sensar IV but the problem is not only physical size, it's that larger antennas are going to be fragile. Have also been looking at a sectional or telescoping pole but would need to figure out how to attach it our TT. An amp will also be needed and will need to be able to rotate the antenna.

