 The use of the radial method is more common in North America, where the FCC and CRTC use it in mediumwave transmission planning and regulation.In Europe and Asia, the use of radials has fallen out of favor since the 1970s, and in many nations the radial antenna proof is only acceptable as an ancillary antenna proof.Canada and Mexico, due to lower population densities, never implemented the fully complete radial models that the US FCC did.