105.9
JACK FM.
Playing what we want.
Pop, rock and adult hits across the decades. JACK FM’s familiar songs and irreverent personality give Missoula listeners a soundtrack that refuses to be predictable.
Playing what
we want.
- Format
- Adult hits / variety hits
- Dial & call sign
- 105.9 FM · KYJK
- Licensed community
- Missoula, Montana
What you’ll hear.
A broad pop-and-rock playlist throughout the day, plus current station contests and local promotions. Visit JACK’s station site for what is happening this week.
Times are Mountain Time. Special coverage can change the daily schedule.
Recent station promotions include a fall Hunters Special and Hoppy Hour with Draught Works. Check the station site for current dates and participation details.
Station programs & current schedule
On the dial.
In western Montana.
105.9 JACK FM · Missoula, Montana
The outline is a third-party coverage illustration. Its field-strength threshold and update date are not supplied. Hills, buildings, antennas and receivers affect actual reception. Coverage shading does not measure audience.
Planning for a particular community? Ask our buying desk to review the location, station and listening path for your flight.
Who chooses
this station?
Mon–Fri, 6 a.m.–7 p.m. · Nielsen SP26
MBC-supplied Nielsen SP26 ranker, user-defined survey area, as reproduced in the approved October 2026 JACK sponsorship sheet. Station estimate; campaign reach and exposure depend on the schedule.
Listeners who choose familiar pop and rock across the decades, a varied playlist, workplace listening and station promotions with some personality.
Buying by demographic?
Specify your age/sex target, survey geography and dayparts. Request the dated station ranker, cume, AQH and composition for that brief. Programming interests below describe the station’s content; they are not measured age or sex percentages.
Request a demographic-specific station briefFormats.
Placements.
A defined flight.
FM commercials, station and seasonal promotion sponsorships, contests and event placements. Ask for the current promotion calendar and available schedule.
Digital distribution
This station’s profile focuses on JACK’s FM and promotional inventory. The MBC digital streaming offer is available on Trail 103.3 and U104.5.
The signal
behind the sound.
A little RF, a little hardware, and the engineering details behind 105.9 JACK FM.
- Frequency
- 105.9 MHz
- FCC call sign
- KYJK
- Facility ID
- 162326
- Station class
- C2
- Published maximum ERP
- 1.95 kW
- Height above average terrain
- 635 m
- Antenna pattern
- Non-directional
- Free-space wavelength
- 2.83 m
The carrier completes 105.9 million cycles each second. In free space, one full wave is about 2.83 metres long.
FCC channel 290 corresponds to 105.9 MHz. The channel number is an engineering identifier; listeners use the frequency on the dial.
The FCC antenna record lists an eight-section array. Antenna gain and height help explain how a modest transmitter output can produce a useful signal across mountainous terrain.
ERP includes antenna-system gain; it is not a live transmitter-output reading. HAAT measures antenna height relative to surrounding terrain, not tower height above ground. FCC engineering reference: final CDBS archive, January 9, 2024; published license listings cross-checked October 14, 2026. KKVU hardware is documented in MBC’s August 2026 transmitter report. Wavelength is calculated from the carrier frequency.