antenna Tam 1480

[WRVU614]

I have a tram 1480 antenna that I would like to use for gmrs, will shortening the radial to 6.7 inches help the antenna on gmrs channels? OR just damage the antenna?

[OffRoaderX]

No. You would need to cut/trim the main (up and down) portion to get it tuned for GMRS. If you cut it too short, it could then be 'damaged', at least for use on GMRS.  I would not attempt this without an SWR meter.