Trouble is, the easiest antennas to build — horizontal center-fed dipoles — start to claim a lot of real estate at these wavelengths.

This article shows how a dipole and and ground plane antenna are similar but also different.

Antennas installed at 18 U.S. high schools detected bursts of radio activity that can precede solar disturbances capable of disrupting satellites and power grids on Earth. The observations helped ...