See those E and B fields they are not widths they are strength vectors I think you are treating them as a physical dimension
they are a physical dimention.
when you are building a digital tv antenna you look up
the frequency of the tv station you want to pick up.
then from that frequency you determine the length of your
pick up wire or material that you are building the antenna from.
the rf wave length never changes its length because the station
is licensed to broadcast on that particular frequency which includes the B , E , and Time dimensions.
the amplitude of the signal is what determines the E and B fields height or width as you call it.
the signal never changes shape or amplitude , it only becomes weak with distance from the broadcasting station due to obstructions or the curvature of the earth.
rf waves are focused or changed by tv antennas by design.
all waves tend to fill in the shadow that an obstruction presents to the wave.
in the above image the rf waves are directed onto the the
pick up wires , notice the pick up wires are of same lehgth.
Please look it up.
