I have used a similar system in the past, with iCam and iCamSource. Actually, things worked better than I thought they would. In iCamSource, you probably would need to select the USB receiver, rather than the actual camera name.
The only draw-back I experienced, was iCam nor iCamSource could see all for cameras at the same time. I set my receiver to alternate between cameras, and the "active camera" at any given moment would show up on my computer (iCamSource) and iPhone (iCam).
Due to external interference, I have since changed to wired security cameras; but the same principle applies.