I just wanted to note one thing that you said that may be a little of topic but still...
You should not see it, I think, as you steal them from better universities.
If they genially are interested in physics (and have the basic "material" for learning) and you give them the opportunity to...
That depends on the antenna structure.
Magnetic field lines are circular around a perfect conductor carring a constant current as given in the classic example.
First assuming TEM mode (no field component in the propagation direction).
In addition to the above poster, the attenuation of a material could be viewed upon as the sum of three things
1) Reflection, at the first boundary of the material
2) Multi-reflection, inside the material between the...
Just a quick note; the breakdown voltage of any medium is highly dependent on the frequency of the field (also the ambient pressure and humidity).
It follows the so called "Paschens law", http://en.wikipedia.org/wiki/Paschen's_law
Mvh