IRI adalah sebuah instrumen yang menghasilkan frekuensi radio berdefinisi tinggi sekitar 2.7MHz sehingga 10MHz.
Article on strange sounds over Samarahan picked up by international blog
Strange Humming - Rumblings Sound Heard In Canada, Sweden, Hungary, Denmark, Costa Rica, Czech Republic : Jan 9 - Jan 12, 201268
January 14, 2012
For anyone who is reading our site regular will know that we have already written a article about "Humming Noise Was Heard In Arnaudville, Louisiana, US on April 4, 2011" and Strange Rumblings Sound Heard In Costa Rica January 9, 2012
Now in latest development a Strange Noise coming from the sky in the middle of the night in Aalborg Denmark January 10, 2011
I am quite sure that it was not a mechanically sound of helicopter or airplane, or a train, because I know how it sound.