Have you ever felt like you were being followed?

Not by a person walking behind you, but digitally by a GPS device that a stalker secretly planted underneath your car.

If you’ve ever suffered from that fear -- or any other paranoid delusion -- here's a list of gadgets that may just put your worries to rest. 

Spy gadget blogs have been buzzing about an anti-GPS tracking device that sells for $300 from trackershack.com, a UK Web site.

The anti-GPS gadget would likely go unnoticed by potential bad guys since it plugs into the standard outlet in your car. However, unlike your radar detector or cell phone charger, this gadget can block GPS signals that are emanating from a radius of two to five meters. It’s a great way to prevent stalkers, assassins and jealous ex-lovers from knowing your whereabouts. 

Now that you’ve alleviated your vehicular paranoia, it’s time to surveillance-proof your home, starting with that always-scary front door.

To get rid of the spookiness that comes from not knowing who's standing on the other side of that door, EndoAcustica.com sells a remote viewing kit that allows you to see underneath it. The Italian company’s Web site shows an image of a ninja using the device. But it could also be used to fight paranoia.

The gadget allows the user to look at an entire room from the ground up. The kit comes with a right angle viewing adapter and gives a clear view of “any barricades or booby traps that may be present.” The company also sells accessories that include a night vision scope and a video camera system, just in case you want to capture a potential nighttime intruder on tape. 

Once you’ve successfully scoped out the booby traps and potential intruders, you’ll probably want to sweep your home for audio and video bugs that may have been planted while you were gone.

An all-in-one bug sweeper from SpyAssociates.com sells for $247.50 on its Web site. It uses laser technology to detect both wired and wireless cameras, as well as audio bugs. It’s also a great way to sweep fitting rooms, hotel rooms, tanning salons and bathrooms.

“It buys a little piece of mind…You just never know,” said Jeffrey Jurist, president of SpyAssociates.com. “If you are paranoid, you would want to be looking at our bug detection equipment.”

For even more piece of mind, you can protect yourself from surveillance devices aimed at your windows by ordering a white noise generator. The device is marketed to the super-paranoid: “Designed for the individual that requires more than simply detecting body-wires and room transmitters,” reads the description reads on SpySite.com. The white noise generator can be yours for $150.

In addition to their collection of secretive surveillance equipment, the paranoid may want to protect their external hard drive’s important PowerPoint presentations, MP3s and pictures with their very own DataLocker, secured with a 12-digit PIN code. 

ThinkGeek.com offers the $99.99 DataLocker, which locks down standard-sized hard drives with a passkey. It’s great if you're afraid your co-workers might steal your documents while you get up for a bathroom break.