How to say "antenna" in Arabic

No genuine relationship, despite the tempting parallel: hawāʾī, 'antenna, aerial', is an adjective from hawāʾ, 'air' — a native Arabic word from the root ه-و-ي (classically glossed as 'the space that falls between heaven and earth'), not a borrowing. Hebrew's own 'air' word, אוויר, really is a loan, but from a different source entirely: Greek ἀήρ (aēr), borrowed in Mishnaic times. The two 'air' words merely happen to mean the same thing — one native Semitic, one Greek. For the device itself the languages diverge again: Arabic built hawāʾī natively ('the airy one'), while Hebrew borrowed the Latin antenna (originally a ship's sail-yard) whole.