On this basis, the question arose, how powerful (in range) is the signal of such modules without the use of additional complete antenna?
If there is an internal antenna on the PCB divorced, so it is necessary to watch their performance.
If internal, no signal with no antennas.
There is no such thing as distance, it depends on a heap of conditions, distances, obstacles, clarity of Fresnel zone, receiving antenna, etc. From millimeters to hundreds of kilometers.