Has anybody noticed a very noticable hum from the stock Wrangler SR/A tires on their Libby the more worn they get or could it be something else?

That's usually normal with Goodyear tires. The more worn out they are, the more hum and rougher ride. Personally I will never purchase Goodyears again especially SRA's. Those are junk!

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2005 Jeep Liberty Renegade 4X4 - Auto - Off Road Package
Pennzoil Platinum Synthetic Motor Oil
General Grabber HTS 235/70/16
Flowmaster Series 40 Delta Flow Exhaust cat-back system
K&N 63 Series Aircharger Intake Kit
Bosch Platinum Ir Fusion Spark Plugs
Hella 500FF Free-Form Fog Lamp Kit
Sony Xplod CDX-GT620IP Head Unit w/Sony Xplod Speakers

Most tires will do that when getting worn down more , even Firestone/ BFGs etc

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Just to let everyone know, I put new tires on & now I ame looking for wind noise items which I never heard with the old tires

The new tires are a world of difference which I never knew with the stock SR/A's.

Goodbye Goodyear.