Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Media market name | Callsign | Analog | Digital | Affiliation |
| --- | --- | --- | --- | --- |
| American Cable Channel 75 Million Homes | WGN America | Varies | NA | Independent |
| Digital Television Networks | Antenna TV/THIS TV | Digital/Cable | NA | shows/movies |
| New York, New York | WPIX | 11 | 33 | CW |
| Los Angeles, California | KTLA | 5 | 31 | CW |
| Chicago, Illinois | WGN-TV | 9 | 19 | CW |
| Philadelphia, Pennsylvania | WPHL-TV | 17 | 54 | MyNetworkTV |
| Dallas / Fort Worth, Texas | KDAF | 33 | 32 | CW |
| Washington, D.C. | WDCW | 50 | 51 | CW |
| Houston,Texas | KIAH | 39 | 38 | CW |
| Tacoma / Seattle, Washington | KCPQ | 13 | 18 | Fox |
| Tacoma / Seattle, Washington | KZJO | 22 | 25 | MyNetworkTV |
| Miami / Fort Lauderdale, Florida | WSFL-TV | 39 | 19 | CW |
| Cleveland, Ohio | WJW | 8 | 31 | Fox |
| Denver, Colorado | KWGN | 2 | 19 | CW |
| Denver, Colorado | KDVR | 31 | 32 | Fox |
| Denver, Colorado | KFCT (satellite of KDVR) | 22 | 21 | Fox |
| Sacramento - Stockton - Modesto | KTXL | 40 | 55 | Fox |
| St. Louis, Missouri | KPLR | 11 | 26 | CW |
| St. Louis, Missouri | KTVI | 2 | 43 | Fox |
| Portland, Oregon | KRCW | 32 | 33 | CW |
| Bloomington, Indiana | WTTV | 4 | 29 | CW |
| Kokomo, Indiana | WTTK 29 (satellite of WTTV) | 48 | 54 | CW |
| Indianapolis, Indiana | WXIN | 59 | 45 | Fox |
| San Diego, California | KSWB | 69 | 19 | CW |
| Hartford / New Haven, Connecticut | WTIC | 61 | 31 | Fox |
| Waterbury - Hartford - New Haven, Connecticut | WCCT-TV | 20 | 12 | CW |
| Kansas City, Missouri | WDAF-TV | 4 | 34 | Fox |
| Milwaukee, Wisconsin | WITI | 6 | 33 | Fox |
| Salt Lake City, Utah | KSTU | 13 | 28 | Fox |
| York - Harrisburg - Lancaster - Lebanon, PA | WPMT | 43 | 47 | Fox |
| Norfolk, Virginia | WTKR | 3 | 40 | CBS |
| Norfolk, Virginia | WGNT | 27 | 50 | CW |
| Grand Rapids - Battle Creek - Kalamazoo, MI | WXMI | 17 | 19 | Fox |
| Oklahoma City, Oklahoma | KFOR-TV | 4 | 27 | NBC |
| Oklahoma City, Oklahoma | KAUT-TV | 43 | 40 | MyNetworkTV |
| High Point, North Carolina | WGHP | 8 | 35 | Fox |
| Memphis, Tennessee | WREG-TV | 3 | 28 | CBS |
| New Orleans, Louisiana | WGNO | 26 | 15 | ABC |
| New Orleans, Louisiana | WNOL | 38 | 15 | CW |
| Scranton - Wilkes-Barre, Pennsylvania | WNEP-TV | 16 | 49 | ABC |
| Richmond, Virginia | WTVR-TV | 6 | 25 | CBS |
| Des Moines, Iowa | WHO-TV | 13 | 19 | NBC |
| Huntsville, Alabama | WHNT-TV | 19 | 59 | CBS |
| Moline, Illinois | WQAD-TV | 8 | 38 | ABC |
| Fort Smith, Arkansas | KFSM-TV | 5 | 18 | CBS |
Question:
what is the callsign for independent affiliation?
Answer:
WGN America