Question: On what frequency was the Radio station on which Julian Schiller started presenting the "Drive" program?

Context paragraphs:
Radio Active (New Zealand): Radio Active is an alternative radio station broadcasting in Wellington, New Zealand.  It broadcasts on 88.6FM (formerly 89 FM) as well as streaming online at www.radioactive.fm.  It began as the student radio station for Victoria University of Wellington Students' Association (VUWSA) in 1977, broadcasting on the AM frequency.  In 1981 it became the first radio station in New Zealand to commence broadcast on the newly available FM frequency.  In August 1992 VUWSA decided that Radio Active could not make any more losses, and sold the station to radioactive ltd in the hope that the station could become financially viable.  Radio Active commenced online broadcasting in 1997, being one of the first radio stations in New Zealand to do so.

RadiOrakel: radiOrakel (lit.  "Radio Oracle") is a feminist radio station in Oslo, Norway, broadcasting on 99,3 MHz in the Oslo area and through Internet streaming.  It is widely believed to be the world's first feminist radio station.  It was started in 1982, when Norwegian authorities decided to allow local radio stations to operate.  Money was then collected at a women’s cultural festival to start up the world’s first women’s radio station.  On October 16, 1982, radiOrakel was founded.  From the beginning, it was a part-time station, sharing a frequency.  Gradually the station has been able to gain more time from the regulator.  It now broadcasts 10 or 11 hours a day.  Rita Westvik was the first editor in chief.  The radio station is mostly run by volunteers.  It has a shared leadership consisting of an editor-in-chief and an executive director, and usually an assistant editor and other people in various management roles.  The management is usually changed yearly.  In the early days the station’s headquarters were at Korsgata 5 but moved together with AKKS (Aksjon Kvinne Kultur Senter- Women’s Cultural Action Centre) to the loft at the Blitz house, where it today's occupied the third floor and the loft.

Radio 538: Radio 538 (Dutch: "vijf-drie-acht" ) is a Dutch commercial radio station that has evolved since 1992.  "538," refers to the wavelength that Radio Veronica was broadcast on in the seventies.  This station was intended for the younger generation and is owned by Talpa Holding and Telegraaf Media Groep.  It has a broad variety of genres including the Top 40, dance, R&B, pop, rock and recent hits.  Traditionally, the station was only obtained through cable, however in 1998 the station upgraded to a different frequency package, allowing for different frequencies by region.  Radio 538 started the hip-hop and contemporary R&B program "Juize", which developed into the radio station Juize.FM on 18 July 2004.  Later, in 2011, Radio 538 created a sister station called TV 538.

Julian Schiller: Julian "Jules" Schiller is an Australian TV and radio personality.  He previously worked at Triple M, Fox Sports, and 7pm Project, and in February 2017, he started presenting the "Drive" program on ABC Adelaide.

ABC Adelaide: ABC Radio Adelaide (call sign: 5AN) is the ABC Local Radio station for Adelaide.  It is broadcast at 891 kHz on the AM band.

WGMF: WGMF is an AM radio station licensed to the city of Tunkhannock, Pennsylvania and is part of the Scranton/Wilkes-Barre radio market.  It broadcasts on a frequency of 1460 kHz with 5,000 watts daytime, and 1,000 watts nighttime power with a directional signal.  WZMF is an AM radio station licensed to the city of Nanticoke, Pennsylvania and is part of the Scranton/Wilkes-Barre radio market.  It broadcasts on a frequency of 730 kHz with 1,000 Watts daytime, and 12 Watts nighttime power.  The WGMF-WZMF studio is located on Wilmar Drive in Tunkhannock, Pennsylvania with phone number 570-836-4200.  WGMF formerly simulcast the adult contemporary format aired by its sister station, WCOZ, now KZ104, in neighboring Sullivan County, but now airs a classic hits format.  The station identifies itself primarily by its translators at 104.3 and 104.5 MHz, hence the name "Gem 104".

Merrick and the Highway Patrol: Merrick and the Highway Patrol was an Australian radio show, presented by Merrick Watts, Julian Schiller and Rachel Corbett which aired on Triple M as well as regional stations nationwide.  The show launched on 27 February 2012 and aired 4 pm to 6 pm weekdays on 4MMM and 2MMM, 6 pm to 8 pm weekdays on 3MMM and 5MMM and 5 pm – 7 pm weekdays on regional stations.  The show ended on 28 November 2013.

WZMF: WZMF is an AM broadcasting radio station licensed to the city of Nanticoke, Pennsylvania and serves the Wilkes-Barre, Scranton, and Hazleton radio markets with a Classic Hits format, switching from Adult Standards and Tropical and Spanish language adult contemporary format in December 2008.  The station simulcasts sister WGMF located in Tunkhannock, Pennsylvania.  WZMF broadcasts at a frequency of 730 kHz with 1,000 Watts of power during the daytime with a non-directional antenna.  During the nighttime hours, the station must reduce its power substantially to just 12 Watts which limits its listen able area to just the local Nanticoke area.  The power reduction at nighttime is required by rules set by the Federal Communications Commission in order to avoid interference from CKAC, a Canadian radio station also on 730 kHz.  WZMF also broadcasts at a frequency of 104.5 MHz with 27 Watts of power from a site atop Dewey/West Mtn near Keyser Valley/Scranton, Pennsylvania which covers Scranton, Old Forge, Avoca, Dickson City, Pittston, and Jessup, Pennsylvania.  WZMF also broadcasts at a frequency of 92.5 MHz with 250 Watts of power from a site atop Penobscot Mountain near Mountain Top, Pennsylvania which covers Wilkes-Barre, Mountain Top, Wyoming, Nanticoke, Hazleton, Dallas, West Pittston, and Kingston, Pennsylvania.

Anja Kontor: Anja Christina Kontor, (born 18December 1964) is a Swedish journalist and television presenter.  She started as a freelancer for Sveriges Radio in 1987.  She started working at Sveriges Television and started presenting "Go'kväll" when the show was first broadcast from studios in Sundsvall, Umeå and Norrköping.  Kontor worked as a presenter, producer and reporter for the show in 1997–2010.  In 1995–97, she also helped launch the TV4 Uppland local news broadcasts, were she handled several different tasks.  At the same time Kontor also produced regular features on "TV4 News" and "Nyhetsmorgon".  Kontor has also filled in and helped presenting episodes of Sveriges Radio show "P4 Extra" and "Karlavagnen".

Guido Hatzis: Guido Hatzis is a Greek-Australian comic character created by Australian comedians Tony Moclair and Julian Schiller and voiced by Moclair.  Guido appeared originally on Schiller and Moclair's radio program "Crud" on the Australian Radio Network Triple M.

Supporting paragraphs: Julian Schiller ABC Adelaide
Answer: 891 kHz