I've been able to easily strip away the black background using the following command
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convert radar.png transparent -black radar-bgclear.png
1) Using the following code(s) I was able to get the radar image semi-transparent, however also ended up with a 'darkened' background that was not 100% transparent.
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composite -dissolve 50% clear.png radar.png radar-1.png
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convert radar.png -channel all -fx '0.5' radar-1.png
2) The following got rid of the darkened background problem, but made the entire radar image that remained gray.
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convert radar.png -channel rgb -fx '0.5' radar-1.png
Any ideas as to how this could be accomplished? Thanks!