Hello,
You need a directional antenna. Size will depend on what frequency
you are using and there are many different configurations.
Contact a local ham radio club to get more information. The
bible for those things is the ARRL antenna handbook,
www.arrl.net, which you probably can find in a local library.
Goran

Luis Moreira wrote:
> Hi Guys,
> thanks for the help, I found a few sites.
> The problem is that this is to much for what I need... I have a couple of RF TX and RX from a remote control project, could I use the TX as the transmitter and build some receiver/detector to detect the RF? how do I make it directional? any ideas or links welcomed.
> best regards 
> 		Luis
> 
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Denny Esterline
> Sent: 30 June 2006 11:02
> To: Microcontroller discussion list - Public.
> Subject: Re: "radio hunting"
> 
> 
>> Hi Guys,
>> A few years back I found a few web sites about this competitions in the
>> US where you go and track a radio signal, like "radio hunting", I can
>> not remember the proper name for it.
> 
> Fox & hound
> 
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