Performance marketing is highly effective at capturing demand, but far less effective at creating it. Elliot Ward, founder of Excite OOH, explains why out-of-home advertising is the missing layer improving search performance and media efficiency.
Digital performance channels are designed to respond to intent. Search, social, and retargeting work best when people are already aware of a brand and actively considering a purchase.
The challenge is that digital channels increasingly rely on the same audiences, the same signals, and the same feedback loops. As a result, many performance strategies are efficient at harvesting existing demand but poor at generating new demand at scale.
Out-of-home (OOH) operates differently. It reaches people outside algorithmic environments and introduces brands in the physical world, where attention is less fragmented, and messages are harder to ignore.
People don’t click billboards. They remember them.
After seeing a billboard, the next action rarely happens in that moment. It usually happens later, on a phone or laptop, and most often via search.
People look up the brand name, the product, or the message they have seen in the real world.
That behavior feeds directly into paid search, SEO, paid social, and direct traffic, even if attribution models struggle to show it clearly.
This effect is closely linked to mental availability, a concept well established in marketing effectiveness research. Mental availability refers to how easily a brand comes to mind when someone is ready to buy.
Research from the IPA, including work by Les Binet and Peter Field, has consistently shown that brands that build strong memory structures outperform those that rely solely on short-term activation.
For performance marketers, this has practical consequences. When mental availability is high, digital ads perform better. Click-through rates increase because the brand feels familiar. Cost-per-clicks fall as relevance improves. Conversion rates rise because trust barriers are lower.
OOH is particularly effective at building mental availability because it operates in the physical world. It delivers repeated exposure at scale, reaches people outside digital targeting systems, and embeds brands into everyday routines. Unlike many digital impressions, these exposures are unskippable and durable.
Their impact carries forward long after a campaign ends.
This helps explain why OOH often improves paid social and search performance without appearing neatly in last-click reports. When performance teams interpret this as a lack of impact, the issue is usually not the channel itself, but attribution models that prioritize immediate, clickable responses.
A more useful way to assess OOH is to look at how performance metrics change once a campaign launches, particularly in search behavior, paid media efficiency, and conversion rates.
One practical way to do this is through regional testing. By running OOH in a defined city or region and comparing results against non-exposed areas, brands can begin to see genuine performance differences rather than chasing direct attribution.
In exposed markets, increases in brand search volume, higher click-through rates, lower cost-per-clicks, and stronger conversion rates often appear quickly. These shifts represent incremental lift, performance improvements that would not have happened without the campaign.
Importantly, these effects are not limited to the campaign window itself. Because OOH builds memory structures rather than driving immediate clicks, the impact often continues after the media has come down. Performance teams frequently see sustained improvements in branded search, conversion rates, and paid media efficiency in the weeks and months that follow, as mental availability compounds over time.
This approach does not provide perfect attribution. What it provides is something more useful: clear evidence that OOH is improving the efficiency and scalability of performance activity.
As digital channels become more saturated and competitive, performance teams are running out of easy wins. Paid media works best when audiences already recognize and trust the brand behind the ad, and that trust cannot be optimized into existence.
The most effective strategies now combine channels that create demand with those designed to capture it. In that context, OOH is not a brand channel sitting ‘above the funnel.’
It’s a performance layer hiding in plain sight.
