Mine picks up stations from 30 miles away (flat terrain). It does have a little trouble with one or two of the lower powered stations though, which always seems to happen at about the same time every evening. Since I removed my amplifier, it hardly ever happens any more.
Where do you find plans for that type antenna?
Here is the model of the one I built:
Gray-Hoverman GH2n with NARODs for UHF/VHF-hi
He has other models as well. He is one of many others who experiment with different television antenna designs who hang out in this forum: