David wrote:
"Antenna is resonant and presenting good impedance. SWR is 1:1.

If the feeder is coax, is there a standing wave on the coax?

If the feeder is open wire, is there a standing wave on the feeder?"

SWR is 1:1 means the line is flat. The line matches the antenna
regardless of configuration. There is no reflection from the load.
Standing waves are produced by a combination of a reflected wave with
the incident wave. No SWR means no reflectiion if coax, open wire, or
any other feedline configuration is in use.

Best rergards, Richard Harrison, KB5WZI