The website for the Canadian Nationals has a page dealing with the topic of US experimental gliders. The short version, if you have an experimental aircraft that you want to fly in Canada, you need to request a Validation of Foreign Flight Authority. Similar to what a Canadian experimental aircraft needs to fly in the US.

Details are he
http://sac.ca/nationals/index.php?op...info&Itemid=15

As far as radio license, a radio station license is no longer required. It is now included as part of annual aircraft fees for Canadian aircraft. Operators do require a radio operators license. I don't know how this is handled in the US, but I assume something like this is required in the US, so the US equivalent would be valid in Canada while flying a US registered aircraft.