How do you increase the range of your prius key?

i've read that if you hold it next to your head, the range increases.

haven't tried it meself

 

Wrap it in foil

 

Parabolic antenna?

Seriously though, what's the practical application of being able to unlock a car from 15+ feet away?

 

wrap tape around the fob with two batteries inside
get one battery made of super lithium

 

There is an old trick
Hold the fob in your hand with that hands thumb touching your chin.
You become the aerial. Sounds mad i know. Try it. It works

 

Sounds like it could possibly work even better if wearing braces on teeth. Maybe a tinfoil cap, like mentioned above #3

 

Wth? I'm living at 8 floor and I can open car from home.
No tinfoil hat or antennas.

 

eurofobs are magic!

 

It's kind of a long story, but I used to own an SC430; with the remote key fob you could raise/lower the top, lock/unlock doors (of course) and unlock trunck of course).

Since the top took a while to go down, I wanted to be able to activate the top mechanism from a far, so that it would be down by the time I got to the car. A friend of mine and I created a system whereby you could phone the car and activate any of the key fob functions from anywhere in the world -- so I guess that's extending the range of the key! We built in security so the car would only accept calls from phones on a white list (lest random people call and unlock the car).

Here's a thread from 15 years ago:
Guess what we did?? - Page 2 - ClubLexus - Lexus Forum Discussion
The good part starts at post #22.

 

Hire a Filipino boy to hold the fob and stand near the car. Tell him to press the button when you signal him to do so.

 

https://driver-safety.wonderhowto.com/how-to/quick-tip-pointing-your-car-remote-your-head-increases-its-range-0139966/

 

Hold the tip of remote to a water bottle, it may increase quarter range.

 

The Science Behind Why Your Head Can Boost A Car Key Fob Signal

For me it's typically to verify I've locked it. Looking out the window at our daughter's, I'd say it's around 40 feet to our car on the street, and fob still works.

 

What bisco said actually works and I saw it on an episode of Mythbusters and it works.

I however have already advanced to rechargable batteries so no more low battery alerts with cheap batteries.