A well‑designed media mix is less about individual channels and more about how they reinforce one another. Out‑of‑home ((D)OOH) acts as a physical, always‑on presence that connects the rest of your investments. OOH builds recognition in everyday environments, while TV, radio, social media and search capture and deepen interest.
Evidence from both academic research and industry studies shows that the greatest impact often occurs when channels are combined, rather than optimised in isolation. MMM studies and industry bodies such as IPA and WFA emphasize that overall effectiveness typically comes from how channels are combined (reach + frequency + distinct roles), rather than from any single channel on its own. In the report “Making effectiveness work”, IPA describes how MMM, experimentation and attribution should be used together, stressing the importance of understanding the whole picture: how different channels and activities jointly drive impact, not just each one individually. Major MMM players such as Ipsos explicitly highlight “cross‑channel synergies” as a key issue: they measure not only ROI per channel, but also halo and synergy effects between channels when optimising the mix.
In combination with TV, (D)OOH builds reach over time. TV can create sharp peaks, while an OOH network across shelters, bus stops, street furniture and standalone sites maintains visibility between heavier burst periods. Burst periods are the shorter, intensive campaign phases when you apply high media pressure over a limited time – for example, a couple of weeks of heavy TV and digital advertising around a launch or promotion. Between these bursts, brands often reduce pressure (“always‑on light”) or are almost silent in certain channels. With (D)OOH, your brand continues to be visible in the same urban environments where the audience moves, regardless of whether TV pressure is currently high or low.
Radio works in tandem with (D)OOH by adding sound on top of an already established visual picture. As listeners move through the city and see the same message on outdoor sites, the link between audio and visual is strengthened. Campaigns can be planned so that radio pressure peaks in time windows where traffic flows and (D)OOH placements deliver maximum exposure.
Social media and search capture the demand that (D)OOH helps trigger. When people recognise a message from the street, the threshold is lower to click on an ad or type a brand name into a search bar. Programmatic buying of digital out‑of‑home (prDOOH) can reinforce this by controlling digital screens in those OOH environments where you know the target audience is present shortly before typical search or purchase moments.
Creative (D)OOH executions – so‑called special builds, productised in Sweden by JCDecaux as “Innovate” – can function as the hub of the media mix. A 3D outdoor installation or a local takeover campaign creates tangible content that can be amplified in TV coverage, social content and PR. Standardised formats such as Eurosize Major Cities or Digisize National around these executions ensure that a broad audience actually experiences the idea in everyday life, not just in feeds.
To identify the best formats for reach and impact, the media mix should be planned from the location outward. Start with where the target audience moves, which environments are strategic, and how (D)OOH can establish a clear baseline presence. TV, radio, social and search are then layered on top of this structure, with clearly defined roles for each channel. In this way, out‑of‑home is used to hold the whole system together, rather than as a standalone add‑on.
