BCACastles on the Air
Discover Belgium's castles and fortresses and bring them to life on the air.
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Discover Belgium · Explore the outdoors · Get on the air
Take your radio outside.
Explore Belgium. Activate heritage. Make worldwide contacts.
The home of portable ham radio in Belgium. Whether you are an experienced activator, a keen hunter (chaser) or just starting your outdoor adventure: BOS! offers exciting ways to explore Belgium's most beautiful locations while enjoying our hobby.
Choose your next adventure
Castles · Mills · Lighthouses · Towers · and much more in BelgiumAlready logged in — or log in with one click — and jump straight to your awards, your points or the log upload of each programme.
BELMOTAMills on the Air
Activate Belgium's beautiful mill heritage and make contacts worldwide.
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BLHALighthouses & Lightships
From the Belgian coast to historic lightships. Shine a light on our maritime heritage.
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TOTATowers on the Air
Activate lookout towers across Belgium and enjoy breathtaking views.
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More programmes
ONFF · Flora & Fauna
SOTA · Summits
GMA · Summits
ONBOTA · Bunkers
IWI · Islands
🔒 Activator Log Upload ONFF
Log in with your BOS! account first
ONFF · Flora & Fauna
SOTA · Summits
GMA · Summits
ONBOTA · Bunkers
IWI · Islands
🔒 Activator Log Upload ONFF
Log in with your BOS! account first
📅
BOS! Agenda
Upcoming activations, events and contests. See what's on the air and join in!
View the agenda →📡
BOS! DX Cluster
Live spots from Belgian activators and worldwide activity. Post & follow activations in real time.
Open the DX Cluster →Also: GMA DXcluster — + Connect to the cluster
📷
Activation Stories
Every activation has a story. Share your photos and experiences with the BOS! community.
Read the stories →📰 Latest news
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More from BOS!
Everything you need for your activationFrom historic castles to mountain peaks
From historic castles and picturesque windmills to iconic lighthouses, lookout towers and mountain peaks: every activation is a new adventure and every QSO tells a story.
BOS! proudly manages
- BELMOTA – Belgian Mills On The Air
- BCA – Belgian Castles Award
- BLHA – Belgian Lighthouse Award
- ONR-TOTA – Towers On The Air
- GMA Belgium – Global Mountain Activity
We also promote and support
- ONFF – Belgian Flora & Fauna
- ONBOTA – Belgian Bunkers On The Air
- SOTA – Summits On The Air
- I.W.I. Belgium – Inland Water Islands
Our mission is to inspire radio amateurs to get outdoors, discover Belgium's rich cultural and natural heritage, and connect with fellow radio amateurs worldwide. So pack your gear, head into the field, activate unique locations, work stations worldwide, earn awards and become part of Belgium's growing outdoor ham radio community.
Adventure starts with BOS!. We'll meet you on the air!
BOS! Sponsors 2026
OS8D · ON8VA · ON3EA · ON2LVC · ON3NYL · DL2ACH · ON8BM · ON5JK · OO7Z · ON3XT · PD0RWL · ON3YB · ON4EC
Your callsign here? Become a BOS! sponsor by donating an amount or buying merchandise in the shop.
♥ Make a donationBOS! Crew
ON5SWA OO2T — Francois Gorremans
Backend cartography (BOS! maps)
New references BCA & GMA summits · Activator & chaser
New references BCA & GMA summits · Activator & chaser
ON4VT — Danny Van Tricht
Founder BOS! (2019) · Activator & chaser
