Flat Antenna Market Size, Share & Industry Analysis, By Installation Type (Indoor / Window-Mounted, Outdoor Fixed, Vehicular / Mobile, Shipborne, Airborne, & Ruggedized Tactical), By Technology (Electronically Steerable, Passive Fixed, and Integrated Flat-Panel Antenna, Backhaul Systems, & Others), By Frequency Band (Sub-6 GHz, mmWave (24-100 GHz), & Others), By Application (Fixed Wireless Access, mmWave Backhaul, Satellite Land Fixed, Maritime Connectivity, & Others), By End User (Telecom Operators / ISPs, Government & Defense, Commercial Aviation, & Others), and Regional Forecast, 2026-2034