precisely calibrated making the reading suspect at best,
useless at worst.
The current stock antenna used is a 'naked lightbulb'
type, probably poorly calibrated, but ok for toy grade use.
You can open the controller up and replace it with
another better manufactured antenna. Even if this is still
a 'naked bulb' type antenna it should be better than the
stock one. It means you can use this mod to extend
range, even giving is a sort of quasi 'spotlight' antenna if
you wanted to, but this means you have to point it in the
right direction
all the time
, it becomes less useful the
closer you are, for instance if you do a high speed pass
in front of yourself and don't turn the antenna to face the
quad all the way along, despite being quite close, you
could quite easily loose signal. Or, using the bulb analogy
again, try pointing a spotlight at a bird flying by and see
how difficult it is to keep it in the light. You want to tailor
the antenna for your specific needs.
SYNOPSYS
If you are wanting to extend range then I would stick with
regular good named brand, antennas for the controller,
the fpv monitor and the quadcopter if you want reliability
and consistency. They may not be calibrated to your