No. Expressvu is not licensed to broadcast, the US is a protected market.
And if you are caught by Expressvu and you can't certify that at least one of your receiver is still in Canada, you'll be: disconnected, charged $35 reconnection fees, charged term deactivation fees. If you still have one receiver in Canada, you're lucky, only the receivers in the US will be disconnected. If I were you, I would not do that.