First-party operational benchmark dataset on digital signage by Kitcast Research: content freshness, screen health, deployment size, Apple TV vs Android reliability, content mix across 21 industries, AI adoption, cost and ROI. Sources: anonymized screen-network telemetry 2026 (aggregates only, N≥30 cell suppression), a 515-operator survey, a 1,000-device hardware-reliability study, and third-party market context (Berg Insight, Grand View Research, Omdia, TrendForce, IDC). Network-size metrics are per workspace, not per company. Survey and public-sourced figures are tagged via the source_type column. Headline benchmarks: median content age 16.8 days; 78.0% 90-day active display rate; average network ~4 screens per workspace (median 1); Apple TV median uptime 99.31%; 76.5% of operators do not measure ROI. Full report: https://kitcast.tv/reports/state-of-digital-signage-2026/