When you think of directional ham radio antennas, you probably think of a Yagi, cubical quad, or a log-periodic antenna. These antennas usually are in a horizontal configuration up on a high tower.

Without directional antennas, the 15,000 or so full-power AM radio stations in the United States at its peak would not have been possible. If the AM band ever goes completely away we’ll be sad ...

The problem is usually worse in stereo mode than in mono. A directional roof–mounted antenna can often help. AM signals are prone to interference by a variety of technical sources: other radio ...