Channels TV and Cable, channels gouged in the Earth. The Grand Canyon is a channel, as is the Galliard Cut in the Panama Canal.
So is KMOX, which I used to listen to. It is a 50,000-watt clear channel radio station, which permits its nighttime signal to be heard in most of the continental U.S. KMOX operates as "NewsRadio 1120" and refers to itself as "The Voice of St. Louis."
##### Encrypted: decrypt with http://www.fourmilab.ch/javascrypt/
ZZZZZ HWPLB NPBLM AHMDN PRBQD XBMBU GBSPH SBDTG IKUWR GCXTB AVLWH
WRNEI ENIPB TTXRU DXAML JWLQG WSSTT FQBWC FTXBM RXFJK WMMMS XMWXD
HBIHD UOHFN SWLDV CMXHN KWTUM XTCLJ KGRUT GGFCS EAHJD JGUGU NQPGJ
IXRTE EHAKW QKIJP LLPXC FMXJV KEGSF KFTWH ILGLP RTPNM SERKX FGEHL
VUVSK ESXBH NLMQV BDWLA MRJHD CSWLO XWRCL XEQOO JNKFI MIKGM BXOBA
LDAFL LOCAJ CTECW DSMUH RUUNN VWOGG NEBRF XGJFI NWRIX WFNTC DLIJP
XBAXU POATW MQJRL ULKCJ EBWNV BFFDE GCSTH PHSII JVMNM VGCOK GBLUT
BJWTZ YYYYY
##### End encrypted message
Enjoy!
J.