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屋根に

on the roof; to the roof

→ 屋根
phrase Rare #32,769
on the roof; to the roof 屋根 means “roof,” and に marks the location or destination. The exact translation depends on the verb: it can mean “on the roof” for something located there or “to the roof” for movement toward it.
JA: 猫が屋根に登ってしまった。
EN: The cat climbed onto the roof.

このアンテナを屋根につけると画面がはっきりする。

If you put this antenna on the roof, the picture will be clearer.