Set the VCR and the transmitter antenna a few meters away from the monitor and its antenna.

Show that the reception deteriorates if the antennas are not parallel to each other, demonstrating that electromagnetic waves are transverse and polarized.  Demonstrate standing waves by holding the receiver antenna 1/4 wavelength in front of the metal chalkboards to improve the strength of the signal.  The signal strength varies with location in general because of reflections off all the metal in the room.

TPT 34, 152-154 (1996).
AJP 65, 22-25 (1997).

Animations of dipole radiation can be found here:  http://www.falstad.com/emwave1/