Hi there! Just to share my last flight experience: Flying this morning to film this incredible church where i was married. Its a dome, and i was too nera the walls when i send the MMwasp to the dome, in a second i lost VLOS and in the next second lost comm with the MM. I was not worried because i knew that he was there....then everything went as expected: the RTH start the action and he land at home. Conclusion concrete walls dont like to be penetrated with radio waves.... see video 0.50min. Hope you like it!Video