This is the antenna I built:
http://www.balundesigns.com/content/OCF Dipole V2.pdf
It uses a balun instead of ladder line to create the impedance match. With a G5RV I would be somewhat concerned about stray RF or fields entering my radio room when transmitting and would want to make sure that my system was properly grounded.
For the grounding system. The best advice I have is follow the NEC, which says to bond your antenna ground to your house electrical ground. I drove two additional ground rods, which all ground rods should be about 10' apart or else they won't function as multiple grounds. The easiest way is to rent a demolition hammer from Home Depot for about $30 (get the mid sized). You will need a ground rod bit for it and may have to buy / borrow one. It will drive the rod in a matter of minutes without any of the water tricks which might leave gap pockets (you want physical connection and continuity) and it won't mushroom the head like other methods.
What I did is put two grounds in and bonded them together and to the house ground with #6 bare copper wire. One of them, near where I wanted the cable to run, I put a bonding plate on the bar like this:
https://www.dxengineering.com/parts/dxe-ucgc On that plate, which I did CLEAN with the cleaning kit I mounted a Polyphasher
https://www.dxengineering.com/searc...toview=SKU&sortby=Default&sortorder=Ascending that the coax passss through. I wrapped it in a weather seal that is basically a self vulcanizing rubber:
http://www.homedepot.com/p/3M-3-4-in-x-22-ft-Temflex-Splicing-Tape-Black-2155/202195401 which you should wrap all your coax connections in. From this plate, I used 1" thick copper strap and ran this to my radio room which is in the upstairs bonus room. There I got a ground bar:
https://www.dxengineering.com/parts/ero-egba14210jf which I clamped the strap to with a piece of copper bus bar and used stainless steel hardware with some copper thread dope (SS is good for RF and you need to use the dope to keep it from corroding due to the dissimilar metals). I then bolted the radio ground lugs via braided strap to this ground bar.
As far as running into the house, I simply made a small slit in the aluminum cover under the roof eve and ran that into a crawl space where I mounted a low voltage box (no back) in the wall and passed the cable and ground strap through that.
You don't need to bury your coax but you can and it certainly wouldn't hurt in terms of adding to your safety grounding.