Trying To See what i Can do

[gorny]

http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3d823011ab01ccf0
First thanks For any help provided.
I currently have a chimney mounted 1970's 14ft long antenna. I have improvised with fixing the ribs with leftover steel rods.
I get like 15 channels some great some annoying.
I receive
8-1 great
8-2 great
15-1 not great when cloudy
15-2 same as 15-1
21-1 choppy
21-2 choppy
27-1 good
27-2 good
27-3 good
43-1 great
43-2 great
43-3 great
49-1 good
49-2 good
49-3 good
I was wondering can I get any extra range. is it possible to get both Harrisburg and Baltimore. What equipment would help me out. If anyone has any patience to help me. I will greatly appreciate it.
Screw cable
thanks
Gorny

[Tim]

Which direction is your antenna pointed now?

[gorny]

I think the arrow part is pointing south east. towards Baltimore.
thanks