The antenna series resistor problem is one of voltage rating rather than power. Most small resistors have a voltage limit because of their construction, in particular ones with tight tolerance because they are trimmed by cutting narrow slits in them with a laser and it makes an easy gap for a spark to jump across. Similarly, some use a spiral of carbon around a core, rather like a wire-wound resistor but using a carbon track instread, these also have a tendency to flash between turns if the voltage is too high. The power rating is almost irrelevant as the duration of overload may only be a few microsconds. I wouldn't recommend using wire-wound resistors in any antenna application though becasue they are also inductive.
All CMOS IC's are voltage driven, they use the static charge on the semiconductor to displace electrons in the conduction channel so apart from current to charge up and discharge the capacitance of the junction, they draw no current at all. That's the reason they need protection, there's no route to discharge any build up of voltage on the antenna. In fact it's entirely possible the gates in your schematic will be operating when they shouldn't anyway, a resistor from the input to ground will ensure the logic state prior to receiving any signal. Even a resistor of 1M or more to ground will ensure the gate is 'low' until a signal lifts it higher.
Regarding FET gate protection, yes that's the Zener voltage to use but keep it as close to VCC as you can.
Brian.