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So far, an aerial drone specialist in California cannot find an exact match with any drone known to be currently manufactured. But there are "black" projects which would be off limits and thus, he would not be able to know everything that might exist or is in the research stages.
But the sound described is consistent with electrostatic field discharges. Tesla coils, for example, give off electrostatic charges that crackle and hum. Such fields are not radioactive. But positively charged ions in plasma fields are known to give people headaches and nausea. One of the hypotheses in the crop circle mystery is that some crop formations have more positively charged ions than negative, which would explain why some investigators become ill with bad headaches and nausea and dogs and other animals stay away. Negatively charged ions are associated with thunderstorms, for example, which energize most people.
Chad also had a very interesting comment about the aerial object's motion. Chad wrote, "It moves almost like an insect. If you have ever seen a bug on a pond, it is kind of like that. It is very smooth and slow most of the time, but then every now and then it will rotate very quickly and go very fast into another direction, then stop, and repeat the process all over again. There is just something very unnatural about the way it moves."