[BC] AM Grounding Question

[Chuck Conrad]

I'm looking at a 5 KW AM in an area with very poor ground conductivity,  I'm told it is a "4".  Would increasing the number of radials (or making them longer) help with coverage?  Are there any other tricks to improve the ground situation?  I realize it is impossible to make any promises without a full site survey, but any answer in gereral terms would be appreciated.
 
Thanks!
 
Chuck Conrad
KZQX Radio, QX-FM
www.kzqx.com or www.qx-fm.com