There are 2 different approaches I have and would use for this application, first being an very large air wound inductor on either an acrylic or plastic former, which to DC is a short circuit to ground and having no affect to the antenna performance (as-long-as the inductance is high enough). This is a typical ham style approach too and sometimes this inductor can reside inside the TX its self connected across the antenna connection. The other option is to use static discharge balls spaced according to the power rating of the transmitter , however this is more of a broadcast thing and with Medium wave masts especially.

The bleeder resister will also work and I'd perhaps choose a valve close to 1Meg ohm and only requiring a power rating of 1/4 W even at QRO power levels of 500W.

One final approach I also see in some Ham home-brew kits are GDT's or Gas Discharge Tubes. Much like a resister and are even use in commercial lighting arresters.