451 Fortwo Remote Range

Hey All,

I'm still loving my '13 - 35K miles, and not a noticeable ding / scratch in it yet.

But, I've noticed this from the beginning, but it is getting worse...
My remote range has always been "bad", compared to say, my wife's Subaru, or friend's Toyota. They can be like just within sight distance of their vehicle, hit the button, and it works.
Mine - I often have to be within 10feet...
And, yes, I have changed the battery. As frequently as last month. No noticeable change in range between an old battery (12 mons) vs. a new battery. But over time, it has gotten worse. As I said, I've often had to be "on top" of the car to get it to work, recently.

Now, I've added things to the SAM, which is where I figure the remote antenna is located, so maybe I've dislodged or run power across the antenna, cutting the range.
Or perhaps the range is supposed to be short.

Now, I've seen a YouTube video that claims that doubling the voltage of a generic 3V transmitter (CR2032) to 6v (2x CR2016) will dramatically increase the range, but I also know that doubling the voltage for most things is BAD. And, since our remotes are already CR2016, I don't know if there is a thinner model available anyway.

Any other suggestions / tips / etc. for boasting the range?

Beyond that, I'm still loving it. I gotta do the front brakes soon - $750 from the dealer or like $100 DIY.... Hmmm, looks like a Saturday job.

Thanks all!

James