I never did receive a definitive answer to the "True RADAR" definition, so I poked around on the 'Web' and found some good stuff. Do you have a minute?
We all agree on the definition of a RADAR note. The definition of a Super RADAR is in dispute. “An example of a super radar is ‘81111118.’ The rules of math and probability say that a super radar will be found on only one note out of a random 1,111,111.”-pcgs.com. I also found, “A ‘Super’ radar refers to notes where the middle six digits are all the same and the first and last digit are the same.” -collectors.com. Heritage Auctions agrees with these definitions of a Super RADAR.
I also found, “There are ladder radars, A12344321A. There are repeater radars, A22444422A.”-oldcurrencyvalues.com. The Repeater definition is the apparent PMG’s Super RADAR definition.
Done, right? Nope. I found, "It is my understanding that a RADAR note is where the 8 numbers making up the serial number is the same when read forwards and backwards. A PERFECT RADAR has the same LETTER at the beginning and end of a RADAR note."-papermoneyforum.com. So maybe there is no True RADAR, but there is a Perfect RADAR. Will this ever end?
So that this wasn't a total waste of your time, this website was very interesting. Check out
http://www.coolserialnumbers.com/HowRareAreFancySerialNumbers.pdf