I built a home made 4 bay antenna, using instructions from online, each wire of the bowtie is 7" long. Higher channels come in great, lower ones not, 18,19 poorly 20 is okay (CBLT-DT 5-1), but just wondering if I add a reflector, how far it should be behind the bows, and whether it would be best flat, or shaped, like a bowl. Strangely enough, 29 should be coming in, but doesn't. Doesn't help that I live in a basement, and can not put anything outside.

Anyone have any ideas, I live in Toronto, in the Bathurst & Sheppard area.