Landessender Beromünster, Radio transmitter and cultural property in Beromünster, Switzerland.

Landessender Beromünster is a mediumwave transmission site on the Blosenberg in Gunzwil, canton of Lucerne, Switzerland. Its main feature is a self-radiating lattice mast of thin steel beams, painted in alternating red and white bands, with a grey cylindrical pod near the top and a thin white spire above it. The mast stands beside the former operations building, now used by the art centre KKLB.

The mediumwave transmitter began operating on 11 June 1931 with a T-antenna on two 125 m masts in Gunzwil, not in Beromünster itself. The self-radiating Blosenberg tower followed in 1937, and from 1978 the station broadcast on 531 kHz. It went silent on 31 December 2008; the Blosenberg tower has been a protected monument since 2009.

The station's name passed into everyday Swiss German as "Radio Beromünster", and its 531 kHz frequency was nicknamed "feuf-eine-driski". Since 2010 the former operations building has housed the Zentrum für Kunst und Kultur im Landessender Beromünster (KKLB), founded by the artist Werner Zihlmann, known as Wetz, with Silas Kreienbühl.

The lattice tower stands on the Blosenberg near Gunzwil, not in Beromünster itself; the former operating building there now houses the Centre for Art and Culture (KKLB). The tower is a protected monument and not generally open inside, so visitors see it from the surrounding area. The original medium-wave equipment is on display at the Museum of Communication in Bern.

In 2021, artists Wetz and Silas Kreienbühl declared the Blosenberg tower itself an artwork through a performance; the piece sold for CHF 100,000 to a collector. The tower, unlike the former operating building, is not owned by Wetz. Its equipment is displayed at the Museum of Communication in Bern.