New coax from inside up to a homemade antenna, should be well under $50. You have plenty of signal. UHF/VHF super simple designs out there. If you can bend a chunk of metal you will be way ahead of what you have now. Try something like the StealthHawk #289 build your own with some scrap add the balun (
under $3) and the coax 100'
$25. You will be living large. May not get channel 6 as it is low VHF.
General info...
http://www.digitalhome.ca/forum/showthread.php?t=140206
Look at post #289, 60" piece of proper aluminum (8' piece at Menards 3/8" is
under $12) We are at $40, leaving $10 for misc (drill a couple holes, screws and washers) and cash leftover for a refreshment. Best of luck!
http://www.digitalhome.ca/forum/showthread.php?t=123803