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There is no direct easy way to hitch from Brussels to [[Antwerp]], although there is some alternative means to reach the ring in the hope to catch a ride along the E19 or the A12. Sadly those are always in periphery of the city. You can take the main highway motorway E19 or the A12 that may be less good if you also want to hitch further North.

Take a train to Brussels International Airport. There are many exits at the airport. You can find one and start hitching from where cars pay their parking-ticket. A bit further down the road towards the highway motorway you'll find a Shell service station. Most cars here stay around the airport, but you may have luck. A final suggestion is to keep on walking along the side-road until it joins with the motorway. Cars go relatively slow here and there is plenty of room for a vehicle to pull over.