Consider replacing the RG-59 first. If any of it has been exposed to the elements, 20 yrs is more than enough exposure to cause problems.
Very compact antennas with built-in amplifiers are almost always a compromise design. If they work, great, but I don't expect much, especially on the lower VHF channels.
If after replacing the coax, you still are not seeing the stations you want, consider a combination antenna such as an HD7015
http://www.solidsignal.com/pview.asp...0Antennas&sku=
Aimed NW there is a very good chance you will still get CH 10 given how strong the signal is.