If folks want to learn more about remote TV detection, there's been some fantastic work done by Markus Kuhn and Ross Anderson at Cambridge University. Check out:

Optical Time-Domain Eavesdropping Risks of CRT Displays, wherein somebody can see what you're seeing on your TV simply by watching the reflected color of your TV set from your window.

Soft Tempest: Hidden Data Transmission Using Electromagnetic Emanations, wherein the authors note that horizontal pixel antialiasing makes it harder for your TV to be detected, but makes for an interesting anti-piracy opportunity: having your computer broadcast your license numbers in the high-frequency pixel information!