Behold, Tony Meloche signalled from keyed 4-1000A filament:

During local nighttime hours, I find myself using the random wire
much more. The broomstick is actually *noisier* at night than the
random wire (most places on the dial - the noise is bothersome with
either one in certain spots), and the darker it gets, the more the
superiority of the random wire becomes evident.

In the day, QRM is prevalent, at night, QRN is.

Take a look at helical/loop/random wire designs at http://www.vlf.it to
see the reason for this. Very interesting.

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca