After some antenna simulations using 4Nec2 (by Arie Voors) I wrapped a wire around my townhouse to create a loop HF antenna. I was curious if it was working and how the actual propagation pattern compared to my predictions. So I left my software defined radio, a Softrock 6.2 (by Tony Parks and Bill Tracey), running for 24 hours. It turned out to be quite an adventure!
Results: 1138 stations made 4907 calls, illustrated as pins in a map below. The pins are colored by frequency, red for 6.9 MHz, blue for 7.1 MHz and spectral coloring in-between.
Mouse over the map to see calls from the Island of Midway to Puerto Rico in longitude, from Alaska to Florida in latitude.
You will need the Google Earth browser plug-in to view the map, and it takes a few seconds to load the data - about the time it takes to read this. If you don't use Google Earth, there is an image at the bottom of the page. - AE5CC
