"These ADS-B units seem almost a requirement for medium sized UAS that fly any significant distance from the GCS. It seems a little overkill for small UAS that operate in airspace not normally used by manned aircraft such as between buildings and at…"

"I'm not exactly sure what this is or what it's capabilities are, but it appears to be a small, low cost ADS-B receiver. (note: receiver only)
http://www.amazon.com/GNS-5890-ADS-B-Receiver-USB-Stick/dp/B006VI3WAK
My guess is that there is ground…"

"There are small, low cost ADS-B systems being developed. I'm unsure where these stand in commercial availability.
http://www.mitre.org/news/digest/aviation/06_08/av_uat.html
I too suspect it will be crucial in any solution implementation under the…"