The Halo Effect: How to Prove CTV and Audio Are Boosting Search and Social

One brand running omnichannel campaigns across DV360, The Trade Desk, and Amazon faced a familiar problem: last-click attribution gave search 80% of the conversion credit, and the CFO questioned whether CTV was worth the spend. A halo effect analysis in Digital Remedy’s proprietary measurement platform, Echo, told a different story. Households that saw the brand’s CTV ads converted on search at 3.4X the rate of households that didn’t.

Now open your own attribution dashboard. CTV’s credit for conversions like those? Zero. Search claims every one, and when budgets tighten, CTV is the first line item cut.

The media that does the work often isn’t the media that gets the credit. That missing credit is the halo effect: the lift your CTV and audio campaigns give to search, social, affiliate, and direct traffic. Measure it, and you may find that the campaigns you thought were underperforming are some of your best.

In the following blog, you’ll learn:

• Why siloed, last-click measurement hides the value of CTV and audio
• What a Halo Effect report shows
• A 4-step setup to start measuring halo lift on your own campaigns
• How to turn the results into smarter budget decisions

Why Siloed Measurement Undervalues CTV and Audio

CTV is no longer an experimental budget line. The IAB projects U.S. CTV ad spend will grow 13.8% in 2026, second only to social media. But the way most brands measure it hasn’t caught up.

Most performance teams run omnichannel across five to seven partners, and each one grades its own homework. Each DSP, walled garden, and analytics tool has its own data, attribution model, and dashboard. None of them are built to show how one channel influences another.

Last-click is especially unkind to CTV and audio. Nobody clicks a TV ad or a podcast spot. They remember it, then search, scroll, or type your URL later. The result: search and social look like heroes, CTV and audio look like cost centers, and budget flows in exactly the wrong direction.

What Is Halo Effect Measurement?

Halo Effect measurement puts a number on that lift, channel by channel, so you can see how much of your search, social, affiliate, and direct performance depends on CTV and audio.

The signal is out there. Industry research shows podcast ads drive a 37% median lift in listener-attributed actions like searches and site visits, and CTV spend drives spikes in branded queries, even in AI search. The challenge is isolating that lift for your brand with your data.

A Halo Effect report shows you:

• Cross-channel lift: How much CTV and audio exposure raises performance in search, social, affiliate, and direct.
• Incremental impact on last-click channels: Conversions credited to search or social that were actually influenced by CTV or audio earlier in the journey.
• Audience overlap: The scale of overlap between households reached by your CTV and audio ads and those converting through other channels.
• Performance amplification: How conversion rates and efficiency change when channels work together versus alone.

How Echo Measures Halo Effect

Digital Remedy’s Echo brings your CTV and audio delivery, your site conversions, and your other channels into one view. Its Halo Effect Report quantifies how CTV and audio drive incremental performance inside walled gardens like Google, Meta, and your affiliate network.

Because Digital Remedy both runs and measures your campaigns, Echo knows which households saw your CTV and audio ads and which didn’t. It compares an interest group (conversions where both the target channel and CTV or audio played a part) against a holdout (conversions where the target channel played a part but CTV and audio did not). The difference is your halo.

How to Set Up Halo Effect Measurement in 4 Steps

You don’t need a six-month data project to start. Here’s the setup:

1. Add UTMs to every channel you want to analyze. Tag your search, social, and affiliate campaigns with consistent UTM parameters so conversions can be tied back to the channel that closed them. Standardize naming conventions now; inconsistent tags are the fastest way to muddy a halo read.
2. Place the Echo pixel on your site. The pixel captures site visits and conversions at the household level, which is what lets Echo connect a CTV or audio impression to a later search click or social conversion.
3. Launch your CTV and audio campaigns. Run them as planned. Because Digital Remedy controls delivery, Echo can separate exposed households from unexposed ones without extra work on your end.
4. Access your Halo Effect reporting. Echo compares the exposed interest group against the holdout and shows the incremental lift CTV and audio are driving in each target channel, from branded search to conversion rate to cost efficiency.
   Pro tip: Start with the channel your team debates most. For most brands, that’s branded search. It usually collects the most last-click credit, yet the people typing your brand name already know who you are, so it’s hard to tell how much demand branded search creates versus how much it simply captures. A halo read settles that debate with data.

The CTV Halo Effect in Action

Here’s what this looks like with real campaign data. In another Echo Halo Effect analysis, CTV-exposed households showed:

28% higher branded search rate than non-exposed households

3.2X higher search conversion rate than non-exposed households

The search campaign wasn’t performing on its own. Households that saw CTV were far more likely to search and convert. Cut CTV to “protect” search efficiency, and you may be cutting the demand your search results depend on.

The brand from the top of this post acted on exactly this kind of evidence. Using its halo findings alongside other Echo insights, it increased CTV budget by 40%, shifted $200K away from over-saturated audiences, and tightened frequency caps to 3–5 exposures. The result: 45% more conversions, a 22% lower customer acquisition cost, and a CFO who approved a 30% budget increase for the next quarter.

Search isn’t performing alone. CTV creates the demand search captures.

That’s the kind of evidence that changes a budget conversation. Instead of defending CTV with reach and completion rates, you can show how much of your search performance is tied to it.

Turning Halo Effect Data Into Budget Decisions

Once you can see the halo, you can act on it:

• Budget channels together, not in silos. If CTV lifts search conversion rates, plan and evaluate them as one system.
• Reset your CPA benchmarks. A search CPA that relies on CTV-driven demand isn’t a standalone number. For example, if a third of your branded search conversions come from CTV-exposed households, part of that search CPA belongs to CTV. Use your halo lift to estimate how many of those conversions CTV made possible, then credit them to CTV when you compare channel CPAs. Search’s true CPA goes up, and CTV’s comes down.
• Defend CTV and audio spend with outcomes. Walk into C-level conversations with incremental conversions, not impressions.
• Optimize sequencing. Pair Halo Effect data with Echo’s Journey Analytics to see which CTV and audio touchpoints most often precede high-value search and social conversions.
• The bottom line: last-click attribution will always hand the trophy to the final touch. Halo Effect measurement captures the value CTV and audio create across your marketing mix and proves the business outcomes last-click misses.

Ready to See Your Halo Effect?

Find out how much your CTV and audio campaigns are really contributing to search, social, and affiliate performance. Schedule a strategy call to learn how Echo can measure the Halo Effect on your current campaigns.