While not detecting drones, you can detect wifi frequencies (beyond your smartphones range) in the area and strength. A cheap (10$) detector is like http://www.amazon.com/AGPtek%C2%AE-CC308-Anti-Spy-Signal-Detector/dp/B008RSH6NG/ref=pd_sim_422_1?ie=UTF8&refRID=1495M9WMC6VKW2QG1S92
Many cheap...
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