@Edent That I don’t know. We’ve got panels too on both aspects and still got signals. Brick and block I feel is worse 
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Ideal seems to be outside in free air, but that’s not always feasible.
Also depends on the direction of what you’re trying to get to, and how much stuff you’re having to go through on the way. Could just try moving to a different window, might be a repeater in a different direction.