Omnex Controls offers wireless transmission of analog and digital signals using radio XMTR/RCVRs.
I've used their product to send 4-20ma signals from flow transmitters to a SLC500 with good results.
I'm not sure what afford means in your request, but NBT has the TSR900 which is a wireless RTU and the TSRLink which is complete end to end wireless analog. See "www.nbtwireless.com":http://www.nbtwireless.com
Charlie H