I am currently running a DFCW-60 beacon on 476.181 kHz, using
the same 10m^2 indoor transmit loop as previously on LF. With 35 Watts
of RF input, estimated radiated power is around 2 mW, with lobes
pointing west and east.
The daytime groundwave signal is visible in the bottom panel of
the DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity,
the groundwave attenuation for this distance would be about 23 dB in
excess off lossless 1/r propagation, resulting in approximately 0.2
uV/m in Heidelberg.