When you search "HDTV antenna" on Amazon, you're going to see about 20 to 30 cheap flat-panel antennas made for city homes. Though they all look the same, I found the Channel Master Flatenna ...

This paper demonstrates that unit cell asymmetry with respect to the transversal axis —or transversal asymmetry— is an essential design parameter in periodic leaky-wave antennas (P-LWAs). Specifically ...

The focus of this paper is to characterize the effects of periodic and aperiodic surface distortions on the performance of membrane reflector antennas. Since the surface of this class of reflector ...