Yeah I'm no expert the only thing I'm sure of is that they're completely different signals which allows them to be used simultaneously without interfering each other.
The two together makes high speed, low latency FPV kwads possible.
No it's 5.8ghz analog wifi is 2.4, the former is for video feed the latter is for tx/rx (radio control) of your aircraft.
Some of the cheaper toy drones have a cheesy wifi camera that'll show a feed through an app your phone, those are jeenkie and prone to problems.
Yes it's for the 30x30 stack. It's also lighter than the 450 however it might break easier but replacement arms are readily available. The 8" carbon frame also looks more modern for freestyle but the old 450 is very good for aerial photography.
The beauty of this hobby and building your own is...
Oh I see it now I guess the first picture is a different angle lol and with a blue canopy.
That must be a U.K. only deal as I can't find it that cheap here in the states.
I just recently gave away a bugs 3 mini as I had no use for it but it was every bit as good as the original bugs 3 except...