Most northerly WSPR spot yet (updated)

Another VE3KCL balloon is floating around today, last heard from JR55 grid (see update), which is so far north, at slightly over 85 degrees, that it is a very narrow rectangle, not a square (as projected).

Update: A little later, the balloon was received here from IR07, which is only between 335km and 225km from the geographic pole -a comfortable beating of my previous record.  Assuming a height for the balloon of 30,000 feet (9.144km), the north pole itself is in fact visible from even the most southerly limit of IR07 (the horizon being 374km distant from this height).

Happy to be one of a small number hearing the balloon at 10-10:30UT.

I was curious to see how much more strongly the balloon would be received at the coast, so my son and I went off to the north coast of Anglesey and set up the trusty 1/4 wave vertical, just ahead of some heavy rain.

Listening 14MHz WSPR at IO73rj, looking north.

We managed two spots from the balloon, with large signal enhancements, relative to the delta loop at home.  First, here's the signal at the coast (I had no time to change the callsign or locator due to weather):

And, second, the delta loop (12:58UT here really is that time, not an hour incorrectly set; the 13:58UT spot heard at the coast was not detected at home, indicating a ~20dB enhancement if we take the limit of detection as -34dB), remembering that the delta is 2-3dB inherently better than the vertical:

So, the 14:08UT spot at the coast was ~16dB stronger on a like-for-like, vertical-by-vertical basis - a power factor of 40 times, with an indication of maybe a bit more available, had we more time to assess.

Here's the plot of VE3KCL at 14MHz being received at home (not the seaside) in IO73tj (vertical delta loop, SDRPlay RSP1a):