try this link
h**p://www.nvlsi.no/Datablad/RF_overview_frame2.htm
think there u'll find something suitable
something else u can try; (depends on witch range u desire)
an video modulator ( everyone has an old broken VCR somewhere
in the howse, atleast, i dont throw sutch things away)
-mostly +5v
-audio input
-video input
-ground. (no need for more to modulate av)
the most modulators are for channel around 36 ( ~600 Mhz carrier)
problem is the low RP.
this u could amplify with a tv-cabel 'booster',
attached with a home-made quart-wave antenna
( output impedance 75 ohm )
greetz, gelly.