WMJH
| Broadcast area | Grand Rapids Metro |
|---|---|
| Branding | La Poderosa |
| Slogan | "Con Sentimiento Mexicano" |
| Translator(s) | W227CG 93.3FM |
| Format | Regional Mexican |
| Language(s) | Spanish |
| Power | 3,600 watts daytime only |
| Class | D |
| Facility ID | 55300 |
| Former callsigns | WISZ (11/10/95-7/10/96) WBYY (11/4/91-11/10/95) WJPW (1965-11/4/91) |
| Operator | Cano's Broadcasting |
| Owner | Sima Birach (Birach Broadcasting Corporation) |
| Sister stations | WMFN, WOAP |
| Webcast | www.mipoderosaradio.com/en-vivo |
| Website | www.mipoderosaradio.com |
WMJH (810 AM) is a radio station broadcasting a Spanish-language regional Mexican music format under the name La Poderosa, licensed to Rockford, Michigan and serving the Grand Rapids, Michigan market. Owned by Birach Broadcasting, WMJH broadcasts with 3,600 watts of power during the day, which, along with its lower dial position, allows it to be heard as far north as Kalkaska, Michigan, as far east as Redford, Michigan, as far south as Three Rivers, Michigan but must sign off at night to protect WGY in Schenectady, New York. WMJH programming is available around the clock on FM translator W227CG 93.3 FM, licensed to Grand Rapids.
AM 810 began operations in 1965 as WJPW and featured a MOR/adult contemporary music format for many years. In 1991 the station was sold and the calls were changed to WBYY. During this time the stations studios were moved from Rockford to 29th Street in Grand Rapids. AM Stereo was also added during this time. In 1996 the stations calls were changed again and from 1996 to 2004, WMJH was known as "Magic 810," airing a satellite-fed Adult Standards format from Westwood One. "Magic 810," which also broadcast in AM stereo for a time, had a loyal audience and respectable ratings for an AM daytimer, but was chiefly popular with listeners aged 55 and older, which led Birach to switch the station's format to brokered Spanish programming, under the name "La Poderosa" (Spanish for "the powerful one"). On November 7, 2008, the "La Poderosa" programming and format moved to WMFN AM 640, after that station's prior leasee, Tyrone Bynum, vacated the station, which, at that point, WMJH retooled its format to lean more towards Spanish-language Adult Contemporary.
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