OS90OSA

The club station ON4OSA celebrates its 90th anniversary with this special callsign.
This call will be active throughout November 2025.
Seven club operators will be active on HF, VHF, UHF, and WARC bands using SSB, CW, and digital modes.
An award will be available for anyone who makes five or more QSOs on different bands, regardless of mode.
A livestream will be available on Clublog, allowing you to see which bands we are active on.
Uploads to QRZ and eQSL will take place once a week, so don’t worry if your call hasn’t appeared in the log yet.

• OSA offers its members and visitors two characterful locations for gatherings:
  Monthly meeting: every first Thursday of the month at 8 p.m.,
  held at the URANIA public observatory, Jozef Mattheessensstraat 60, Hove.
  A cozy evening full of radio talk is guaranteed!
  Important note: if this Thursday falls on a public holiday (such as 1 January 2026),
  the meeting will be postponed to 8 January 2026.
  Radio adventure aboard the West-Hinder III:
  for a truly unique experience, OSA invites you every first Saturday of the month, from 10 a.m. to 4 p.m.,
  aboard the historic lightship West-Hinder III.
  This piece of maritime heritage, located at Droogdokkenweg 4 in Antwerp, serves as a special club station operating under the callsign ON9BD.
  No activity will take place on public holidays.