You may or may not know, but there are weather satellites pushing un-encrypted images down to earth all the time. With the right equipment and know-how you can capture these images and take a look. The guys over at SDR for Mariners put up a little write up on how to do so.
They’re using the infamous cheap RTL-SDR dongle, but almost any SDR would work as long as you can capture the right frequency and have enough bandwidth. This is being done on windows using SDR Sharp. This is a great way to learn more about using your SDR, besides aren’t you tired of tuning FM with your SDR ?
Read the full post here.