The current nearest feed to Brisbane is the one from YBAF Archerfield (nowadays the main general aviation field for the City - but way back in the 1930s the main airport and the main base of QANTAS - their old hangar is still in use for GA engineering).
There is no feed from the main airport which is a pity as whilst it is not super busy it does have its moments and has some quite interesting movements at times plus some unusual weather and procedures at times (such as the night time preferred configuration - weather permitting - of arrivals on 19 and take offs on 01 due to noise abatement issues).
The Archerfield feed does include one Brisbane Radar ATC frequency but does not cover the Brisbane airport frequencies as such. It would be tricky to find many locations which would give good VHF reception of both Archerfield and Brisbane Airport as there are some low hills in between and the fields are on opposite sides of the City.
As for the Kingsford-Smith issue - Sydney Airport's official name is Kingsford-Smith (though the locals still call it by its pre-1953 name of Mascot - old habits die hard plus it's easier to say!). The confusion maybe comes from Brisbane International Airport (Eagle Farm) being the home of Sir Charles Kingsford-Smith's historic 'Southern Cross' Fokker F.VII tri-motor (which he and his crew used for their epic and historic first air crossing of the Pacific in 1928 from Oakland to Eagle Farm (via Honolulu and Fiji). It is preserved in a special building over the road from the International Terminal if you are ever in the area. Also, the main road from the City to the airport is called Kingsford-Smith Drive. It passes near to Sir Charles' birthplace in the suburb of Hamilton.
