Have you tried the www.linxtechnologies.com page?  They have several
solutions that may work for you.  I'm using their HP module - but I don't
know if it will work for your case - the range is good (up to 1 mile), but I
don't know what you can stand for antennas, etc. They are introducing new
stuff all the time and they have a transceiver that may do the job (very
compact).

Dan


>Hi all!
>
>I'd like to build a small, "keychain" RF remote control much like those
used
>for car alarm control. My "only" other requirement is that the remote
should
>be bidirectional, ie: able to receive digital data (4 status bits will do)
>from the device being controlled.
>
>The usable range for the remote to the device should be some 30m (100ft).
>However, I'd like to have an usable range for the device to the remote of
>about 1Km (0.6 mile).
>
>Power at the device being controlled is no problem. Likewise, size is not a
>problem there.
>
>Conversely, at the remote, size, weight, power consumption and heat
>dissipation should be as small as possible (like any decent remote). I am
>thinking in 5cm x 2.5cm x 1cm (2 inches x 1 inch x 0.4 inches) to be the
>absolute maximum size.
>
>Forget the digital part. I will be using a pair of PIC 16C73 and the
>excellent Holtec 3^18 remote control ICs.
>
>I need help with the RF part.
>
>I have been looking at some "ready to use" data RF modules, and while they
>are adecuate for the remote to device transmission, none of them comes
close
>in the device to remote part in terms of usable range (I need 1Km or 0.6
>miles). I have already considered devices from:
>- Convergent INC - http://www.convergentinc.com/
>- RF Monolothics - http://www.rfm.com/
>- Radiometrix UK - http://www.radiometrix.co.uk/
>
>Does anyone know of a device suitable for this application?
>
>Thank you for your support!
>
>Regards,
>Andres Tarzia
>Technology Consultant - SMART S.A.
>e-mail: atarzia@smart.com.ar