[kps]

Wikipedia¹ has a more interesting answer to "Why?" —

  After World War II, the FCC moved FM to the frequencies between 88
  and 108 MHz on June 27, 1945. The change in frequency was said to
  be for avoiding possible interference problems between stations in
  nearby cities and to make "room" for more FM radio channels. However,
  the FCC was influenced by RCA chairman David Sarnoff, who had the
  covert goal of disrupting the successful FM network that Edwin
  Armstrong had established on the old band.

¹http://en.wikipedia.org/wiki/FM_broadcasting_in_the_United_S....

[ef47d35620c1]

RCA went after Armstrong. They knew that by convincing the FCC to change the frequencies they could seriously disrupt FM and make existing equipment useless. Armstrong later committed suicide. His wife won all of the on-going lawsuits. Basically, RCA broke him financially and mentally with multiple lawsuits and years of "discovery". Armstrong is the father of frequency modulation (FM) and some argue the father of modern radio.

[twoodfin]

Ken Burns did a terrific documentary on the RCA/Armstrong fight and the birth of radio generally, Empire of the Air.

http://www.pbs.org/kenburns/empire/

[jejones3141]

I'd be among them, since he also came up with the regenerative, superregenerative, and superheterodyne radios.

[gorner]

In fairness that's more about the current range of FM frequencies (originally in the 42–50 MHz range), not why they all end in an odd number.