the rti remote uses the linx 418-LC premade rf modules coupled to a linx splatch antenna (which is a planar antenna). the problem is that, as everyone knows, the reception is positively horrible. to fix this, there are a number of ways to improve the transmitter performance. first of all, there is a circuit inside the remote between the transmitter module and the antenna called a t-attenuater. the purpose of this circuit is to drop the output level to below fcc limits if/when a high gain antenna is used. you can take a small length of 50 ohm cable and connect the output directly to the splatch and this will improve the rf strength dramatically.

secondly, i personally think that the splatch antenna sucks, but it is nice in that it is hidden and works a little bit better than a trace or helical antenna, but if you dont mind putting a stub antenna on the front of the remote, you will get a 3-5 db gain right off the bat. this of course will involve drilling a hole in the remote just below the rf window and mounting the mast. you will also need to add a small ground plane behind the mast for the best results. try using a small piece of copper sheet in the bottom of the case and attaching it to ground.

thirdly, if you really want to boost the range, you can add on a linx broadband amp module. this is a little more involved in that you will need to bring 5v, gnd and the antenna leads off of the board and to the module and then the output to the antenna, but it will provide 20db of gain. the part is available thru digikey and is part number bba-519-a-nd and costs $15

finally, you can simply remove the linx modules from the t2 and irf-6 and replace them with better/higher quality modules including linx own 900 mhz es series. if the t2 is going to be used in a city environment, getting out of the crowded 400 mhz band is the single best improvement you can make.

keep in mind that of course any of the modifications will probably void your warranty with rti and i do not expect that they will be too pleased with having thier product fiddled with. but if you have had to deal with frustrated customers as i have, a voided warranty is nothing compared to the screaming, thrown remotes, and threats of violence over having spent 1000 bucks for something that will not work reliably.

also keep in mind that to do some of these things, you will need to have some electronics experience. if you do not, get someone to help you who does. at any rate, performing any of these mods (or all of them) will not cost alot, for 30 dollars will cover them all, which is a far cry from the hundred plus dollars i have heard of people charging.