[TowerTalk] Tools for Installing Ground Rod?

[Dr. Howard S. White]

My soil is very, very hard clay which makes it a perfect tower base... in fact we had to jack hammer it out to build the base...

... Strong constructions workers hitting the top of the 8' ground rods with Sledge Hammers they were able to drive 1 in about 4 feet and one about 5 feet...  neither is deep enough.... 

Any suggestions on what mechanical or power tool to use to drive ground rods further into the ground.  Plus I want to put in a few more....
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Howard S. White Ph.D. P. Eng., VE3GFW/K6  ex-AE6SM  KY6LA
Website: www.ky6la.com 
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