It really depends on power. For example, radar uses an ionizing tube to block high power radar waves from the magnetron and allows the low power reflected waves to use the same antenna and waveguide.
“It really depends on power. “
No, it depends on frequency.
“For example, radar uses an ionizing tube to block high power radar waves from the magnetron and allows the low power reflected waves to use the same antenna and waveguide.”
Source?