"Jeff" wrote in message ...
For once Gareth is correct, slot antennas can be, and are, fed with
coax. A quick Google or look in the RSGB VHF/UHF Handbook with show
several designs, mostly for 23cms and above.
Those are not slot antennas but Alford Slot Antennas from the name of the
inventor.
I don't think it can be said that it is only the gap that radiates .
For me those antennas are more behaving like magnetic loops in horizontal
polarisation made of a very wide flat conductor
The slot is the capacitor and also a parallel transmission line
Both not supposed to radiate.