if now 1 km range would be standing ...

I would have given full marks.
Two campers go,
is the understanding with exercise very well.
Just do not keep too close to the mouth.
But if an RV around the bend was,
or behind a truck, or further away,
no chance.
6 km range, I find completely
exaggerated, perhaps when both on
an absolute level each on a 50 meters
high sequoia sit.
This untruth costs two star.