Small and effective antenna that would have transmit range of 4-5 meters

Hi,

I am trying to transmit 433MHz-FM signal via small antenna.
The transmit area is very small that would be 4~5 meters, however, as transmitter size have to be very small, antenna size should be minimized.
This is first time for me to design FM system so need some advices from experienced person.
Please any body recommand small and effective antenna?
As I mentiioned, transmittion distance is small..
Thanks a lot.

For better range, the antenna must be matched to the transmitters frequency which is usually caulated by a formula for quarter or half wavelenth. But as you mention that the distance required is just 4-5 meters, just a wire of 6 inch connected to the antenna terminal of both The TX and RX modules, will yield more range than your expectations.
Cheers

You can use a 1/4 wavelenght wire and make it a coil as an antenna. It's a helical antenna.