Another set of rabbit ears with arms that attach in the same way should also work. There is nothing "magic" about the Terk ears. The main thing is that they extend enough to work for the desired VHF signal. For UHF channels, the log periodic antenna does the work.
I see some cheap Terk HDTVa Antennas on eBay but they either don't ship to Canada or want more for international shipping than the antenna is worth. Sometimes it just sucks to live outside the USA.