If you have no access it s hard for me to tell you to go to extremes to find a way.
Do you need to ground antenna in attic.
If you look at the image below you ll want to use a 6 awg ground wire for all of your grounding runs and suitable ground clamps.
In the case of an attic installation your tv antenna will be sheltered from the environment so there s no need to ground it for that reason.
Some attics are dark unwelcoming places used only for extra storage and in those cases nearly any antenna will get the job done.
However the connection of your antenna coax to various ac operated equipment in this case your converter box or tv introduces the potential of electric shock.
Agreeing with adtech i don t see the nec requiring you to ground an indoor antenna system.
Below is an image taken form the nec code book that shows how to properly ground a tv antenna.
Antennas mine are receive only for fm tv and public safety bands will be generally restricted to the attic.
If you find the attic install unsatisfactory and you move the antenna outside then you definitely do need it.
There is no requirement to ground an indoor or attic antenna.
Keep your grounding parts however.
Typically the house wiring and gutters represent a much lower impedance path to ground for lightning than the floating attic antenna.
If you ve taken the time to insulate lay flooring or even decorate your attic however you may want something that s a little less of an eyesore.