Roy, surely you realise that all depends on soil conductivity and
permittivity which B, L & E forgot to determine before leaving the
site.

30 years previously, around 1905, Sommerfeld (and others) had produced
a significant report showing the importance of ground characteristics
on radiation and propagation at LF and below. Which B, L, & E ought
to have been aware of if they had known what they were about.

You should concentrate your thoughts on HF and above, not on LF and
VLF distractions. Different characteristics prevail at HF at which
frequencies amateurs are most concerned.
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Reg