What happens to a photon after it is absorbed by an antenna? I recently have read about interception of wireless information, however this mentions that people can intercept the information, and then somehow the recipient also gets the  information. Regardless of this context, what happens to the actual photon if it is absorbed by one antenna how can another person receive the same signal? Is it that when the photon is absorbed exciting the electron, the electron will then leap back to the lower energy state causing it to emit another photon? so the antenna acts as a receiver & transmitter? to be honest I'm confused overall in how antennas work.
 A: The radio waves or microwaves that are used for communication don't contain just one photon. They contain a bunch. (Maybe someone will do the math for how many photons a standard radio broadcast antenna is producing each second; it'll blow your knee-high off even if you're wearing sandals over them.)
Consider for example a frequency-modulated signal. The information is contained within the frequencies/energies of the outgoing photons. You might remove one photon, but there are many others with the same signal/frequency information also traveling in different directions that you don't intercept.
Thus, intercepting just one photon doesn't destroy these communications. But it does destroy the photon; it is absorbed by the material of the antenna and is gone.
A: It is a big misunderstanding that we name radio waves and photons electromagnetic radiation and this masked the different nature of this two phenomenons. A single photon or a serie of photons we get by acceleration of a electron (or the nucleus). This we call emission. A single photon travels as a single object through space until he gets absorbed by an other electron (or nucleus). Photon of a certain energy has a certain wave length and - due to the constant velocity in vacuum - frequency.
Radio waves are a composition of the photon emissions from all the accelerated electrons in the antenna rod. The frequency of the radio waves depends primarily from the generators frequency. But for equal frequencies you get - depends from the generators power and the tuning of the generators frequency with the (more or less) standing waves in the antenna rod - different energies of the radio waves. This is a substantial difference between photon emission with constant ratio of frequency and energy and wide range of this ratio for radio waves.
Even more, radio waves carry energy in packets. This is natural because the usual antenna is made as a rod and the acceleration of the electrons inside the rod is limited by the rod length. The generator has to switch the current direction to give the electrons the chance to accelerate again. Between this accelerations the energy of the radio wave is indeed zero. The photons energy cant be zero, its energy does not disapear at some points in the space. If some mathematics tell something else then it shows that the Maxwell equations have been made for radio waves, Maxwell doesn't know anything about photons.
Radio waves dissipate, a single photon never do so. A single photon can be received only by one object and this object (a electron, a nucleus or the mixed state of more then one electron etc.) has to have certain properties to receive the photon. A radio wave can be received by more than one object and the antenna rod can have any form, can be made from a broad range of materials and last not least can have a tiny length comparing to the emitter rod length. This is because the radio wave is modulated and carries a different number of photons or /and photons with different energy. The sequence of this variations make it possible to transport information from the transmitter antenna to the receiver antenna.
