Gross reach is the total number of contacts a campaign generates where the same person can be counted multiple times if they are exposed on repeated occasions. It is a measure of all exposures, not of how many unique individuals the campaign reaches. In an out‑of‑home context, gross reach reflects how persistently the campaign “leans in” on people in their everyday lives, day after day.
In OOH, gross reach depends on factors such as traffic flows past the sites, dwell time in the environment where the site is located, how many sites are used and how they are positioned, as well as the campaign’s duration and weight – i.e. how often the message is shown or played. A screen in a major commuter hub with long dwell times will generate more contacts than a site in a faster‑moving flow, and a campaign that runs for several weeks with many plays per day will naturally accumulate higher gross reach than a shorter, lighter burst. The number of sites and their geographic spread also matter: the more relevant locations the campaign occupies, the more contacts are built up over time.
High gross reach is critical when you want to build broad coverage in the target audience and secure sufficient frequency. Out‑of‑home messages typically require multiple exposures to stick and translate into behaviour – people need to see the campaign repeatedly in their everyday environments for it to move from “something I’ve seen” to “something I act on”.
Gross reach captures precisely this accumulated effect of all those contacts.
In planning, gross reach is used to assess a campaign’s overall weight and how OOH/(D)OOH strengthens the rest of the media mix. By understanding how many contacts out‑of‑home generates, you can plan how it should complement TV, online video and social media with more frequent, repeated contacts in everyday flows. Where TV and online video may create powerful but more point‑in‑time impressions, OOH ensures that the message recurs in the physical environment – on the way to work, in retail, at key hubs – steadily building both memory and behavioural change over time.
