Only thing I've done to the slide on my unit is treat the rubber seal with 303 protectant. Never had any issues with it.
Yes, I got rid of the cheap Jensen tv antenna that came on my unit and replaced it with the King Jack antenna, directional adjustable from inside w/signal strength meter and power boosted. Factory antenna only picked up 'snow' ... with the King, can get clear reception on 5 or 6 channels in most instances. Pleased with the results.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.