High Quality Content by WIKIPEDIA articles! WHO-DT (known on air as WHO-HD) is a television station that broadcasts on Channel 13 in Des Moines, Iowa. It is affiliated with the NBC television network and serves most of central Iowa. The station transmits from the WOI Tower in Alleman, Iowa, which is actually owned by WHO-DT`s owners. WHO-DT brands itself as WHO-HD on air, indicating its high definition broadcasts, though the legal call letters are WHO-DT.