The wide skyscraper is another ad unit that has taken over as one of the most prevalent ad units visible throughout The Internet. This ad size is recommended by all of the major ad networks, including Google AdSense, Microsoft Advertising and the IAB (Interactive Advertising Bureau). Unlike most of the square ad units, the skyscraper is designed for very specific locations, as it is very tall and thin, although not as thin as its predecessor, the 120 x 600 – Skyscraper. The skyscraper is very useful for small columns, or rails, on your site, under menus, categories, tags or other, similar list-type content.
Because of this, the 160 x 600 – Wide Skyscraper has become harder to find, as wider screen have allowed the navigation columns to expand to 250 or 300 pixels, accommodating the larger square ad units. However, a lot of properties are starting to put the Wide skyscraper next to a list or menu in the wider columns that are now found in most modern layouts.