OOH advertising, what the initials cover, the four format families and who you actually buy each one from

OOH stands for out of home advertising, meaning any advertising a person meets while they are away from their own screens: roadside panels, transit, place-based screens and street furniture. DOOH is the digital subset, where the panel is a screen running a loop rather than a pasted poster. The useful definition is not about the initials, though. It is that out of home is four different purchases, owned by different companies, priced on different units, and bought through different people, and getting a sensible quote depends on knowing which of the four you are in.

Google Keyword Planner shows 170 searches a month in the United States for this group of phrasings, read on 31 October 2026 against the United States geo target, counted as the group maximum rather than the sum.

The four format families

Roadside. Billboards and large-format panels along roads, sold by the panel owner or a broker, usually in four-week cycles for printed inventory and in share-of-loop terms for digital. This is the category most people mean by the word.

Transit. Rail, bus, airport and station inventory. The owner is usually the transport authority or a contractor holding its advertising concession, which means a single phone number controls a whole network and you cannot cherry-pick the way you can roadside.

Place based. Screens and panels inside venues: gyms, pharmacies, offices, petrol forecourts, lifts, cinemas and retail. Sold by networks that aggregate many small venues, and the thing being sold is a context rather than a location.

Street furniture and small format. Bus shelters, phone boxes, kiosks, wall wraps, A-boards. Often held under municipal contracts, which is why availability is tightly bounded and why permissions matter more here than anywhere else in the category.

How a rate is built, in the unit each family uses

Printed roadside is priced per panel per cycle, with production and installation as separate lines. Digital roadside is priced on a share of a loop, which means your advert appears once every so many seconds for the duration bought, and the honest comparison between two digital panels is impressions delivered rather than slots held. Transit is priced per network or per vehicle count with a minimum. Place based is increasingly sold on a cost per thousand impressions, which makes it the family that compares most easily to digital advertising generally.

Three lines always sit beside the media cost and are left out of first conversations. Production, meaning printing or file preparation. Installation, including the labour window. And, for digital, creative versioning if you want different messages by daypart. Ask for all four as separate numbers, and treat a single all-in figure as a reason to keep asking.

The measurement question, asked properly

Out of home impressions are modelled, not counted. An audience figure for a panel comes from traffic and footfall data combined with visibility assumptions about angle, distance and dwell, which is a reasonable method and is not the same thing as a server log. So the question to ask a seller is not how many people see it. It is which measurement source the figure comes from and whether the same source was used for every panel in the proposal.

Two panels quoted from two different audience datasets cannot be compared on their audience numbers, and a proposal mixing sources without saying so is the most common way an out of home plan looks better than it is. Ask once, in writing, and the answer either arrives in a sentence or it does not arrive.

The two numbers to settle before anybody quotes

The geography you are actually buying. Out of home is bought by location, so the plan is only as good as the definition of where your customers are. A radius is usually wrong. A list of the routes, stations or postcodes that matter is usually right, and it is the thing a good seller can work with and a weak one will replace with a package.

What the advert asks the reader to do. A person passing a panel has seconds and no keyboard. The realistic actions are remember a name, search a name later, or scan something while stationary. A panel beside a motorway cannot ask for a scan. Decide which of the three you are buying before you brief creative, because it changes the artwork more than any other input.

The brief that gets a usable proposal

• The geography, as a named list rather than a radius
• The window, with the start date and whether it is fixed or flexible
• The budget, stated, because withholding it produces a proposal aimed at your patience
• Whether production is included or you are supplying finished material
• The one action the advert is meant to cause
• The audience data source you expect every figure quoted against

Six lines, one page, sent to three sellers. The spread you get back tells you who read it. For the ownership question, which decides who can actually book what, our comparison of the large panel owners and what each publishes before a call is the next thing to read.

Where out of home earns its place, and where it does not

It earns its place when you need a lot of people in a defined area to learn one short thing, and when the thing is simple enough to survive three seconds. A new location opening. A name you want recognised before a sales team calls. A category where the purchase is infrequent and the brand you half-remember wins the shortlist.

It does not earn its place when the budget is small enough that one panel is all you can afford, because a single panel in one place is a sample of one. It does not work as a direct response channel with a measurable last click. And it does not work when the message needs more than about seven words, which is the real limit nobody writes down.

Questions about out of home advertising

What is the difference between OOH and DOOH

DOOH is out of home on a screen. The media is the same category, the buying unit changes from a cycle to a share of a loop, and the creative can change by time of day, which is the main practical advantage.

Can a small business buy a billboard

Yes, usually through a broker or on a short digital flight rather than a printed cycle, because digital inventory can be sold in shorter windows. Treat one panel as a brand presence in one place, not as a test of the channel.

How do I measure whether it worked

Set the baseline before it runs. Branded search volume, direct traffic and enquiries mentioning the location are the three readable signals, and you want at least four weeks of before data to compare against. A geographic holdout, where you run in one area and not another, is the strongest design available without a research budget.

Who owns the panel I want

Look for the owner's name and panel identifier printed on the structure itself, which is how brokers find them too. Then approach the owner directly and a broker separately, and compare.

Do I need permission beyond buying the space

The panel owner holds the planning consent for the structure. What you may still need is approval of the creative, both from the owner and, in regulated categories, from whoever reviews your advertising claims. Ask about the creative approval window before you book the dates.

What the panel sends people to do

Out of home works by making somebody remember a name and look it up later. That lookup used to mean a search box and increasingly means a question asked of an assistant, which answers with a shortlist rather than a page of links. If your name does not appear in that shortlist, the recall your panel paid for arrives at somebody else's business. AI Knows Us measures which of those answers name you, and the measurement is worth taking before the posting date rather than after the campaign is over.