Are radar detectors legal?

(As of September 2017, please check your local laws)

United States: 
Radar detectors are legal in the United States except for in Washington DC, Virigina and military bases. Illegal in all commercial vehicles over 10,000 pounds under US federal law.

Canada: 
Legal in British Columbia, Alberta, and Saskatchewan.

Other Countries & Territories: 
Please contact your local authorities.

Where do you suggest I mount my radar detector?