Load balancing WCF with basicHttpBinding can be done using the keepAliveEnabled property when there is connection reuse. Basically this property when enabled, enables a client to maintain a persistent connection with the service and gives enhanced throughput with connection reuse with multiple messages. But in a load balanced farm we cannot have a client strongly associated with a server and so need to disable this property.
This can be accessed through a custom binding as follows.
<httpTransport keepAliveEnabled="false" />
If you are interested in TCP load balancing check out this post by Kenny
This article should give you more information MSDN