Have a look here for some good tutorials …
Waddle Aero has a series of tutorials for Maven 
I’ve already watched this one, and will do again along with the others. His voice reminds me a bit of ‘Whispering’ Bob Harris from the Old Grey Whistle Test! In fact I might have another squiz to familiarise myself before crawling into my pit…
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Didn’t go to Barry Island in the event. UAV Forecast and Ventusky both showed 22mph northerly winds; the drone can cope with these but it’s marginal and with the wind blowing out to sea I decided not to chance it, especially with my luck! Of course, as it happened, the wind was nothing like the forecast, but it was too late to do much by that time. More homework with Maven tutorials, starting to get the gist and could set some stuff up for Thursday to try it out.
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Other committments got in the way of flying on Thursday, unfortunately.
Wednesday saw the postie turn up with my replacement CE r/c for the Mavic 1, and I had a go at pairing it with the drone yesteday avo, with some trepidation after the problems with the previous r/c (FCC, unsuitable for UK market drone) and the one previous to that (CE, correct, but buggered battery that wouldn’t hold a charge). And Thursday Amazon delivered a set of signal boosters and reflectors I’d orderd to go with this r/c.
No need to have worried, the pairing went without issue, and the booster/reflectors fit easily. Sunday evening for test-flying this beastie, or Wednesday if the rain holds off! I’m a bit nervous of this drone, though, because of the limitations of the wifi connectivity and the lower wind rating… But it is no bad thing to have a backup.
Save your money
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Agreed.
There are plenty of threads on here covering those plastic antenna things from China, and if memory serves @TheJohnster we covered it briefly in one of your other threads where we said a powered RF amplifier was the only hardware solution worth looking at (for software solutions, search here for FCC mods).
You’ll get better results by just shouting at the drone than using those plastic antenna covers 
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Or using coke cans on your router at home (we all tried that didn’t we?)
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Coat hangers as TV airiels they was the days.
Probably where the idea came from😂only that it actually worked
Well, they were inexpensive and might make a small difference; given that the main shortcoming of the Mavic Mini is the wifi connectivity, or lack thereof, it’s worth a try, even if the effect is only psychosomatic; any genuine improvement is going to be marginal at best and my awareness of wifi’s limitation will restrict the Mavic Mini to close-range work anyway.
What will probably happen, though, is that they will break or sacrifice themselves to the gods of lost things, or I’ll get fed up with the bother of fitting them to the antenna and taking them off and packing them away again at the end of the session. I tend to be a sucker for faffy gimmicks but if I hadn’t bought them I’d have only wasted the money on fripperies like rent or food…
They are only of any use on the Mavic Mini controller, and can’t be fitted to the RC-N1 for the Mini 2, but that’s got pretty good Occusync connectivity anyway.
Another possible waste of money in the pipeline (bought it, not delivered yet) is a phonescreen sunshade for the RC-N1; I find the phone screen a problem in bright lighting even with the brightness turned up full. This looks as if it will work, but also looks to be a bit awkward and flippyflappy, prolly u/s in a bit of wind; we’ll see!
I had the same issue with my Mini, and the Mavic Air which preceded it. I tried the parabolic reflectors and they did seem to have an effect - over an empty beach with no reflectors max range was around 400m, but with reflectors I managed over 2km
Impressive, and encouraging! I would think that anything that made the reception more directional would help, even in a ‘busy’ wifi environment, but of course would mean that you’d have to pay close attention to holding the controller facing the drone, which is a pretty narrow vector range over 2km, or even 400m. I won’t be going that far anyway, I’ve set a 150m limit for distance.
I’m guessing your 2km was with the Mavic Air, which is a bit easier to maintain VLOS with over that sort of range!