Personally I think eBay is pretty safe honestly. As long as something doesn't look too good to be true. I've only been burned on eBay once in 20 years, and my CC company refunded me immediately. eBay is pretty safe I think as long as you buy new...
You are you on 365, 24/7, 1440 minutes a day. I highly doubt you actually have time to fly a drone. Anyone would be hard pressed to find a thread you have not commented on.
Get a life.
A network engineer has loads more experience than you do in...
You can read the scientific papers and I attached in previous posts. I said nothing about altitude and wind. That's obvious that the orientation of the drone itself will have an effect on the signal. That's not something that 'many people don't...