From HFUnderground
The Vault 15105 USB Test eQSL
The Vault is a European shortwave pirate radio station. The station is very active as of June 2022. Audio quality is very good and people who send in a reception report will receive an eQSl. The frequency is usually 6985 kHz in AM mode but occasionally tests are done for listeners in North America on higher frequencies and sometimes in USB mode.