This question pertains to the EM field of a Pulse W5017 dipole antenna. The data sheet of this antenna can be found here (which contains information regarding the radiation patterns).
There are TWO parts to this question. Edited to remove the second part. Let's see if anyone can answer the first part.
The radiation patterns of the antennas are as shown below (from the datasheet):
Can the 3D view of the radiation pattern (combining information from both horizontal and vertical planes) be visualized as below? (Ignore the horizontal antenna in the picture, just the two lobes are relevant; in fact my antenna is positioned vertically).
What happens to this lobe with distance?
The answer will only be accepted (and the bounty awarded) if a good intuition is provided in the three dimensions. I have removed the second part already since it requires more research.
An insight into the following parameters would be a bonus!
Frequency [MHz]: 868 - 928
Nominal Impedance: [Ω] 50
Return Loss (dB): -8
Gain (dBi): 2