That's just too long for my purposes. The device with the radio is supposed to be "portable". Hopefully the whole thing could be put inside a smallish plastic box.
Anyway, if a 83mm wire (came with the module) or spring antenna were the alternatives, which is better?
(Could it be that the antenna hole is about 3mm away from ground plane, and that's why 83 mm, not 86 mm wire?)
And still, if, for some reason (and out of curiosity), you need to use the spring antennas, how do you solder them?
I mean, how long the gap between the ground plane and the "coil part" should be? Or maybe the point is the total height from the ground plane? Or does it matter at all as long as the "coil part" has right dimensions?
And have I been conned, because the measures of the spring antennas are pretty different that web gives you for 433 MHz?
(Mostly "coil"-diameter of 5.5 mm is given, my antennas have 4.3 mm diameter, 20 mm "coil" length and 12 mm straight part.)