Potential answers for "Grp. sending radio signals into space"

⭐⭐⭐⭐ SETI
⭐⭐⭐ OMENS
⭐⭐⭐ ETHER
⭐⭐⭐ TRIODE
⭐⭐⭐ FAINTLY
⭐⭐⭐ ONAIR
⭐⭐⭐ WIGWAGGING
⭐⭐⭐ AMFM

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