Hi Emman,
I believe this is how it works - please check with an expert.
When you say RFBL should terminate into ground - do you mean ground = 0V? It will not work since the opamp will rail.. (remember it is single supply)
If you mean RFBL should terminate into ground = Vcc/2? Then I believe it should work if the input is biased to Vcc/2. But then we are back to my original question that the IGND is not stiff enough...
I also have a feeling that you could supply IGND from outside. In the scenario that you have dual supply that are not exactly symmetrical - you will have the same scenario as giving a Vcc/2 voltage to the pin in a single supply situation.
(thanks for the capacitor-link, although I don't think RF circuits is the most important aspect here)
I recommend that you do not answer this unless you are 100% certain of the answers. I believe questions in general are better left unanswered than given misleading information.
Best Regards
/John