The RTL2832U sticks can be used as inexpensive ADS-B receivers. There are several RTL2832U chipsets available. The RTL-2832U / R820T is one of the newer entries on the market. This video is a comparison of the RTL2832U / E4000 vs the RTL2832U / R820T receiving ADS-B signals. It appears that the R820T chipset does a much better job than the E4000 in receiving ADS-B signals.
