Why most of the radio stations have their name starting with "K" or "W"? Why most often 4 letters?

Question

Why most of the radio stations have their name starting with "K" or "W"? Why most often 4 letters?

Answer 1

"K" and "W" are only in the US.  The station owners choose their "call sign", and many try to approximate where they're located, such as KSAC might be in Sacramento, CA., or a local landmark, such as KABL in the San Francisco Bay Area, after the cable cars.  They had a distinctive sound of the cable car bells whenever the call sign was given on air.  

Many of the early radio stations had three letter calls signs, KGO in San Francisco, KSL in Salt Lake City, or KFI in Los Angeles.  Sometimes the station used their network affiliation in the call sign, WABC or WCBS in New York, KABC in Los Angeles.

Stations in other countries use different letters.  Canada starts with "C", Mexico starts with "X" (XETRA in Tijuana)  Other countries have their own letters as well.  There is an international organization which controls the country codes, but within each country, the government controls the station call signs and all other details such as broadcast frequency and transmitter power.

Answer 2

lol I was gonna say: "perhaps in the USA they do" as I often listen to either Virgin radio or Jazz FM and I see no Ks or Ws in there.

But yeah, I do agree that Sky.fm has a K in it!

Answer 3

K is west of the Mississippi, W is east of the Mississippi.