WNNJ (103.7 MHz) is a commercial FM radio station licensed to Newton, New Jersey and serving Sussex County.

The signal covers Northwestern New Jersey and reaches parts of northeastern Pennsylvania and Orange County, New York.

The station played mostly easy listening instrumental cover versions of pop tunes along with a couple of soft vocals per hour.

There were similarly formatted stations heard in Sussex County from the Lehigh Valley and New York City which were more popular, so WIXL had trouble competing.

Some crossover material was heard but it was the hard core country sound that drove the station.

Core artists included Merle Haggard, Waylon Jennings, Tanya Tucker, Sonny James, Charlie Pride, Johnny Cash and Dolly Parton.

In 1979, Simpson Wolfe sold WIXL along with WNNJ to Marvin Strauzer and Michael Levine under the name Group M Communications.

Well known crossover country artists like Kenny Rogers, John Denver, Linda Ronstadt, Rita Coolidge and Eddie Rabbitt were played as well as cuts by country rock artists like Neil Young, Lynyrd Skynyrd and The Eagles were added to the mix in moderation.

Out of fear of being beaten by a competitor, WIXL dropped its country music format on May 28, 1988, at noon.

In 1992 the station dropped the Power 103 name to simply be known as 103.7 WNNJ-FM following the departure of PD Larry Bear.

In September 1998 Chuck Seese and Deanne Schulz were teamed to host the morning show, replacing Pat Butler.

DJs during this era included Christa Robinson, Chip Miller, Mike Malone, Vince Thomas, Brett Alan, Andy Roberts, Frank Bruno, and others.

Chuck Seese returned to Nassau's WSBG in Stroudsburg PA, and Schulz became a publicity executive.

In the Winter of 2001 Nassau sold WNNJ-FM along with WNNJ 1360, WSUS, WHCY, and local marketing agreements for WDLC and WTSX, to Clear Channel Communications.

WNNJ's transmitter is located in Frankford Township and transmits at 2,300 watts as a Class B1 FM station.

In September 2004, the studios and offices moved into state of the art facilities in Franklin on Mitchell Avenue along with other iHeartMedia stations in the Sussex County cluster, WHCY and WSUS.