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A bit of time on my hands and an old silver rod down the end of the garden buried behind the greenhouse, Hmmmm Lets make a 20M vertical. So I ripped out the coil and soldered a piece of wire in place, Drooped the length to 16.5FT with three 16.5FT long think wires buried under the lawn and I got a decent SWR, Needs a bit more fiddling with but it's under 2.0 at the moment. It seems to be working better than my horizontal dipole so far. Happy days
No particular loss at all with the buried 'radials'. There's no need for them to be an exact length because the capacitance and conductivity to the soil will stop resonance but any length(s) like that will assist RF grounding.
Adding several more will definitely help. The NDB 327kHz transmitter I worked on had abt 20 heavy stranded bare copper wires radially out from the T-antenna's base, buried just under the surface of the field. The T-ant was not particularly large. Biggest problem was stopping folks parking under it.
So I added another buried radial, Thats it now I have run out of wire and it's too damn hot to go digging the lawn to bury cables. Got my SWR down a bit more and a few nice contacts. That will do
Lets make a 20M vertical. So I ripped out the coil and soldered a piece of wire in place, Drooped the length to 16.5FT with three 16.5FT long think wires buried under the lawn and I got a decent SWR, Needs a bit more fiddling with but it's under 2.0 at the moment. It seems to be working better than my horizontal dipole so far. Happy days 
It's working so im happy for the time being.