You can see the results he gets using the setup as an AM radio receiver in the video after the break. He tested against a meter long antenna and found that his setup far outperforms it.

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 ...

A directional roof–mounted antenna can often help. AM signals are prone to interference by a variety of technical sources: other radio stations, power lines and computers. Lighting sources also ...