You can increase range by using better antenna's. Look for a WiFi shop and you will find larger antenna's with a better output and sensitivity

Update.. Tested out 3 different antenna's from a local computer store, no real sucess... Finally decided to pull the trigger on a 4Px transmitter to see if that would do any better, no such luck.

Looks like I will have to find a radio/electronics guy that is willing to bump the transmitter voltage, or just leave well enough alone.

Maybe changing the length of antenna if still using AM or FM. 2.4mhz a different animal, lengthening the antenna changes the wavelength, 4" antenna are good enough for 2.4mhz, some aircrafts are even shorter, some of them are 1" in length.

That's exactly what we used to do back in the 90's. A lot of the Futaba radios of the time used 7 'AA' batteries, but you could find battery holders that could hold 8. It pumped up the range slightly and cut down on glitches. But those were AM radios, and probably analog, so they didn't care what the voltage was as long as it wasn't ridiculous high. I don't know how today's digital radios would cope with the extra voltage.

There are certain +3 up to +12dB antenna's

Like:
https://www.amazon.com/2-4GHz-9dbi-R.../dp/B0044DX59M

gonna Test out a few tonight if the weather holds, I'll report back...

Just be aware that depending on your location, you may be breaking the law if you boost TX power above the legal limits.

IM in the sticks of Pa... I'll check out the FCC, but I doubt I'll be doing any harm. Crazy we make these laws, yet cant pay anyone to enforce them... :confused: Government:o

What you need is an air transmitter package, sticks but that is fine.

I am running a Heli receiver in 1 car, and see no difference... If what I am reading is true, 2.4ghz protocal is limited air or surface.... but there is so much conflicting data it makes my head spin.

I can confidently say that all of the futaba 2.4 stuff has about the same range.