What is the initial dimension of the Skyscraper/Tower ad unit?

The initial dimension of the Skyscraper/Tower ad unit is correctly identified as 160×600. This ad unit is designed to be vertically oriented and is typically placed on the side of a webpage, allowing for more engagement space and visibility to users as they scroll through content. The dimensions 160×600 provide a tall, narrow format that can effectively showcase visual elements and attract viewer attention without taking up too much horizontal space, which is particularly beneficial in a multi-column layout found on many websites.

Other dimensions listed, such as 728×90 and 300×600, correspond to different ad formats. For instance, 728×90 is a standard leaderboard banner, which is wider and intended for horizontal placement at the top of a webpage, while 300×600, known as a half-page ad, can provide a broader space but does not fit the traditional skyscraper classification. The dimension 180×150 represents a smaller, square ad unit, which is not suitable for the Skyscraper category. Thus, recognizing that 160×600 is the definitive measurement for a Skyscraper/Tower ad is essential for understanding digital advertising formats.