70 MHz Whispering, whatever that is!!!!

I was trawling the internet for some more interesting projects on 4m when I came across the following article from 2 years ago on Ron PA2RF's Blog, it is about a mode called "WSPR",

WSPR (pronounced "whisper") stands for "Weak Signal Propagation Reporter." This program is designed for sending and receiving low-power transmissions to test propagation paths on the MF and HF bands.  Users with internet access can watch results in real time at WSPRnet.  Version 2.11 of WSPR includes FMT, a package of command-line utilities that can help you make highly accurate frequency measurements without expensive laboratory equipment. Experimental versionWSPR-X is also available, offering an optional mode WSPR-15 with 15-minute transmissions and better sensitivity by about 9 dB.  I have come across some more information about this mode on the following website:

http://physics.princeton.edu/pulsar/K1JT/wspr.html

Ron has experimented on this mode on 70Mhz, see below from his blog:

"Yesterday evening it was too hot (25 degrees C at half past 9) to stay inside or even worse, sit behind the rig in the attic. A perfect moment for unmanned radio beacon operation while sitting in the garden. The homemade 70 MHz transverter and FT450 rig were switched on and the WSPR program was enabled on the PC. Only two Dutch 4m stations were active on 70 MHz yesterday evening (PA0TBR at 61 km and NL8992 at 138 km).
In spite of this low amount of WSPR participants on 4m it was good to see that both stations picked up my 10 Watt WSPR signal at 70.0925... MHz transmitted via an indoor inverted-V antenna in the attic. Later in the evening I found a nice eQSL card from Anthonie NL8992 from Ommen (Drente) - showing his farm in the snow - in my eQSL inbox."