Well the main channels on "C" band would be OK if they were moved to "Ku" band, if it were not for the excessive rain/snow fade problems with the higher frequency's, the lower frequency 3 to 4 GHz band has less problems with the rain.

NBC has found this out when they moved their East/West feeds to SES 3 "Ku" band, some areas had to go to much bigger dish's then planned.

Are the damaged dish's aluminum mesh or steel?

If the damage is just dents in the mesh, a form could be made and using a rubber faced hammer, the dents can be pounded out, this would be a two man operation.

If big holes in the mesh then it's a new section, but I have successfully stitched up some rips in a mesh dish, and also stitched in a patch or two and it went well, the saftey tie wire used for aircraft nuts is 30 to 40 gauge stainless steel, this works well for stitching both aluminum and steel mesh.