Hi,

Well, I receive some answers, found others on the Internet, all is now
written in my 3 pages (see ref below).

The big pictu
There is surely no influence of HV power lines at 300m away. And probably no
QRM on HF bands at that distance either. But will know more about HF
consequences when will be on the air in the field...;-). I retain the idea
of Cecil on 40m.

No study can confirm the direct relation between some leukemia and HV power
lines located to say 100m from houses. There are leukemia observed with
radiation equivalent to a exposure to an HV power line 75m away.
On the other hand, companies recognize that beneath pylons (25m away) there
is a risk for the health (and some electrical devices) due to the strong
current and voltages, far higher than the current limits (see end p3 of my
text,under guidelines) which are thermselves, already 50 or 100x higher to
the values potentially at risk for security reasons.
But I don't see how we could contact a leukemia without a durable
exposition. It doesn't come eating your familiar food and cookies... or half
the population 'd be contaminated. As around the concerned spots studied by
IRPA there is no other powerful sources of emission excepted these sad
pylons...
At last, the risk is not black or white depending on the distance or the
radiation level. All this is progressive and hard to define, hence the deep
fog envelopping all studies.
WHO is currently studying the problem more deeply.

More info of my site with many links and some books to read.
http://www.astrosurf.com/lombry/qsl-em-radiation.htm, tables p2, ref p3

73
Thierry, ON4SKY