We are planning our first flight in a few weeks in central California. In my research I have found some conflicting info on the need for radar reflectors. Some sources seem to indicate one is necessary only for flights with payloads greater than 4 lbs., some say 6 lbs., and others say for all flights no matter what the payload weight. Personally, I would prefer to use one even if we are not required to (we will be well under 4 lbs.) but I don't want to use one if for some reason it would create a problem. In other words, would air traffic control prefer us to NOT have one because they don't want our little balloon showing up on their radar? Any input on this would be greatly appreciated.