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Daniel,
Rich can probably answer this better than I but he is correct that the field strength in volts/meter (an intensity) decreases directly with distance.
The inverse square law applies to power which decreases according to the square of distance. In calculating the field strength in volts/meter it is OK to use the linear decrease with distance.
Your reference to the ARRL stating that the intensity follows the inverse square law caught my attention. I opened my ARRL Antenna Handbook and read “In free space the field intensity of the wave decreases directly with the distance from the source.”. Maybe your book is wrong?
Neil
