John Smith I wrote:
What would you attribute the fact the "photons" in HF behave much
differently then then the photons of VHF/UHF/SHF/LIGHT to?

In a free space vacuum, they all behave
essentially the same way. Their different
quantum energy levels causes them to interact
differently with the atomic structure of matter.

At 1 MHz, a photon has an energy level of
4x10^-9 eV while a gamma ray photon might have
an energy level of 4x10^+9 eV or higher.
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73, Cecil http://www.w5dxp.com