An UHF Terrestrial Freeview TV antenna installed at the roof of my property for many years, and I upgraded it with an amplifier a few years ago, so it can provision Freeview TV service to 6+ TVs installed in the each bedroom and each lounge in this two story property. the roof is concrete tiles structure and there is a lot space in the roof cavity area. is there any antenna system could be installed inside the roof cavity to replace this on-roof antenna system for the same Freeview TV service? please recommend. thanks.