3 ms·We won't be able to make two-way contacts with European stations.by drmpeg 5y agoWe won't be able to make two-way contacts with European stations.tantalor 5y agoWhy notdrmpeg 5y ago420 MHz (and above) is generally line of sight propagation. The frequencies mentioned in the article (29.25 and 51.7 MHz) are able to reflect/refract off the ionosphere and allow much longer propagation paths.