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Antwerpen is a nice city in Belgium, close to the Dutch border.
Hitchhiking is pretty common in Belgium, especially in the North, so you won't have a difficult time.
Follow Amerikalei to the on ramp for the A14/E17. You have to go under a tunnel before getting out to the ramp. A good place to stand is here.
A better option is to hitchhike at the "Waaslandtunnel". Often called by locals the "konijnenpijp". There is much room because of the bus stop and cars drive slowly because of the nearby traffic lights. Many drivers go direction Gent, so you shouldn't be standing longer then 15 minutes. here.
South towards Brussels, Luxembourg
Get a train or some other form of public transport towards “Oost Staation”. When you leave the station, walk under the train bridge, walk straight down to the signs for Brussels. Here, you should stand after the traffic lights and in a position that you get the attention of cars coming from the two different sections of the junction.
Take a tram/bus to STENENBURG stop - any of 21, 24, 242, 420, 421, 422, 423, 429. Once you get off there, turn left and go under the bridge. After you cross the bridge, turn right and keep going straight on, until you see signs of Brussels. After a while you will notice a motorway on your left going in direction of Brussels. Go untill the traffic lights and cross them twice following the road signs. You will notice a good interstate, with an emergency line, where you get your rides very fast (took me around 2 minutes).
North towards Amsterdam
Get a train to 'Luchtbal' somewhere here? or tram 6 (Direction Luchtbal) from Antwerp Central Station. Look around properly to find a McDonald's nearby. Stand at the side of the road just behind McDonald's for a lift to the Netherlands - it's a slip road but there is enough place and you won't stay behind the highway sign. The traffic is quite sparse but the cars go by slowly.
There is a massive service station, before Breda, on the Dutch-Belgian border, where it is easy to hitch-hike for example near the exit from the gas-station. You just have to write a board, because the highway divides into two directions nearby.
Another option is the motorway at the Luitenant Lippenslaan (a continuation of the Plantin en Moretuslei), the on-ramps there are good for heading to Gent, Paris, Brussels, the Netherlands and possibly more directions. Make sure to make a sign as people can go many directions.
Nearby metro stops include 'Draakplaats' and 'De roma'.
The direction from Antwerpen to Netherlands (Eindhoven, Maastricht), also direction to Hasselt: motorway E313. You have to go to the end of the Platin en Moretuslei and on the big crossroad turn left. Then go straight ahead until you will see big sign (Eindhoven, Hasselt), which you have to follow. Near the sign there is good place to hitch hike. Also the motorway exit at Turnhoutsebann is good.