> Stations will only appear on odd-numbered frequencies, like 88.1 MHz, 94.5 MHz, 107.3 MHz, etc. There's a technical reason for this - every FM broadcast takes up about 150 KHz of bandwidth, and spacing the broadcasts like this allows for an extra 50 KHz of wiggle room.
I believe the odd-numbered frequencies were chosen because if only even were allowed then there would be legal knock-down-drag-out fights over the round numbers.
I don't think it's anything so interesting. The FM band starts at the round number of 88.0 MHz and ends at 108.0 MHz. To divide that evenly into 200 kHz channels without bleeding over the ends of the band, they have to be centered at the odd decimal points.
I noticed a long time ago that the frequencies for AM channels are always divisible by 9 (at least in Australia). Never looked into why (those were the days before the internet...)
I believe the odd-numbered frequencies were chosen because if only even were allowed then there would be legal knock-down-drag-out fights over the round numbers.