Or use a solution I talked about with iBeacons which is an approved Apple and Android technology. Another benefit of this solution is it works anywhere, even in your car, since your phone is the RFID receiver. This can tell your alarm panel when you enter your car, for example, even if your car is in the middle of nowhere (as long as there is a cell signal.) put another iBeacon in the garage and your panel will know when you approach your garage. iBeacons are about $25 and battery life can be 2 years plus.
Let me explain how iBeacons work, for those that don't know.
Instead if an RFID receiver and an RFID transmitter, things are reversed. iBeacons are Bluetooth 4 transmitters that you put at fixed locations, in your garage, for example. The RFID receiver is your phone which receives Bluetooth. Every phone nowadays does this.
So your phone moves with you, but the iBeacons remain at fixed locations like your garage, or they can be in moving locations, like your car.
If your phone has an app. that is iBeacon capable, it can use your phone's Bluetooth to detect when its near an iBeacon, which are individually coded. If your iPhone application is SPACE (the HAIku successor) then it is iBeacon capable. But wait, SPACE is an app. that can control your OMNI panel remotely. So putting all this together, all you need is iBeacons to be able to control your OMNI panel from anywhere.
Place iBeacon in garage. When SPACE detects iBeacon, it tells your OMNI to open garage door. You don't need any RFID receivers, and your RFID transmitters are iBeacons. If you placed an iBeacon in your car, when you approached your car, your OMNI could announce in your house for your wife that you were in your car. Lets see you do that with the simple RFID solution discussed here.
Currently SPACE only supports iPhones and iPads so if you have Android or ELK you might be out-of-luck. But if your using an iPhone, and an OMNI, its a pretty cool solution, not that it can't be done on Android or ELK in the future.