Size comparisons

In 1995, the CN Tower was declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers. It also belongs to the World Federation of Great Towers. The following year, the Guinness Book of World Records officially changed the CN Tower's classification to "World's Tallest Building and Free-Standing Structure". Today, the Guinness World Records state the CN Tower as the "Tallest Freestanding Tower". This is because the Petronius Platform oil rig in the Gulf of Mexico is taller, yet most of the rig is underwater.

There are also many guyed towers taller than the CN Tower, the current tallest being the KVLY-TV tower in North Dakota at 628 m (2,063 ft) tall (see List of masts), but these are guy-wire supported structures and not classified as free-standing.

There are currently five proposals for towers whose final heights are to exceed the CN tower's, three of which are currently under construction. At the forefront, the Burj Dubai would, according to present claims by its developers, become a taller free-standing land structure than CN Tower sometime in 2008; work on that tower has, as of October 31, 2006, reached the 80th floor and 277 metres (~908 ft).

View from the tower's Glass Floor.

The builders of the CN Tower did not expect that it would hold the tallest structure record for thirty years. Previous record holders had quickly been supplanted. Several rivals have been proposed and most schemes collapsed. This is partly due to the development of cable television soon after the tower was built which greatly reduced the need for such broadcasting centres, especially in urban areas. Only in cities are there enough tourists to make such a tower viable as a tourist attraction.

Use

The CN Tower has been and continues to be used as a communications tower for a number of different media, and by numerous companies:

Television broadcasters

• CBC

• CFTO-TV

• Citytv Toronto

• Global Ontario

• LOOK TV (a digital cable provider)

• Rogers Cable

• Sun TV

Am/fm radio

Callsign	Frequency	Band	Branding	Notes
Master FM				Consortium of Toronto broadcasters for Digital audio broadcasting
CFMJ	640 kHz	AM	AM640 Toronto Radio
CFMX	96.3 MHz	FM	Classical 96
CFNY	102.1 MHz	FM	102.1 The Edge
CFRB	1010 kHz	AM	Newstalk 1010
CFTR	680 kHz	AM	680 News
CHFI	98.1 MHz	FM	98.1 CHFI
CHIN	100.7 MHz	FM	CHIN Radio	Primarily in Italian and Portuguese
CHIN	1540 kHz	AM	CHIN Radio	Primarily in Italian and Cantonese
CHUM	104.5 MHz	FM	104.5 CHUM FM
CHUM	1050 kHz	AM	1050 CHUM
CHWO	740 kHz	AM	Prime Time Radio
CIAO	530 kHz	AM	AM 530 Multicultural Radio	Broadcasts from Brampton, Ontario
CIRC	1610 kHz	AM	--	Proposed sister station of CIRV-FM
CILQ	107.1 MHz	FM	Q107
CKFM	99.9 MHz	FM	Mix FM
CJAQ	92.5 MHz	FM	92.5 JACK FM
CJCL	590 kHz	AM	The Fan 590
CJEZ	97.3 MHz	FM	EZ Rock 97.3
CJMR	1320 kHz	AM	--	Ethnic Chinese Christian radio in Mississauga, Ontario
CJRT	91.1 MHz	FM	JAZZ.FM91