[Micro S2000]

ok this is sorta weird. all my cars are 27mhz and my brothers has a 49mhz, and a clone (45mhz). now all my cars work fine, but the microsizer 49mhz wont get a signal. the only time it works is when its on the controler and the intenna is close to the car, and it doesnt even work like that. but the 45 controler can control it if its touching our close (about 1 cm). i took the car to hobby town and the controler they had worked on the car. i told microsizers this and they sent a new controler. i tried to get it working again and still no luck. i told microsizers it still didnt work and they sent a new car. but still the new car and transmitter dont work with any of the 49mhz cars or transmitters. lately i tried moving the car with one on the controler and the other one was charging. they would both work once in a while and this only happend when the old car was on the transmitter.

i'm totally confused with the cars and was wondering if someone has an idea with whats wrong with them. the only thing i can think of is a 49mhz signal is going threw my house and stoping the car from responding other than that i'm stumped, help would be greatly appreciated