I have one of these I got recently to test with:

https://www.amazon.com/Bolton-Technical-Cellular-Antennas-Compatible/dp/B07YNZX5PT

I am actually quite impressed with it, compared to some actual PROFESSIONAL LMR antennas. This has a F/B ratio of 10-15db depending on frequency:

https://boltontechnical.com/content/geek-sheets/BT151038-The-Quicksilver-5G-Geek-Sheet.pdf

$62, I am not sure how that translates to Loonies these days.. what about $1B??? :) ;) ;)

To get some better F/B ratio you might consider grid reflector antennas:

https://excel-wireless.com/product/698-755-mhz-grid-parabolic-antenna-10-dbi/

Unfortunately the spec sheet page on their site is FUBAR'd... I am pretty sure I have the PDF in my archive, but its not something I can locate quickly.. The reflector will help to block stuff from behind...

I've got several of their LMR yagis for things, and again, happy with them.. especially as I think they are much cheaper than similar stuff in the LMR trade..

IF you are just looking at amazon etc. sites, you need to get to the actual manufacturer site to get the detailed specs F/B, gain, etc..

More info on the desired application as you listed

Is the stuff you want to listen to 180' apart? or less? Distance to this "distant repeater?" And this is truly a conventional repeater, and not a trunked system? And is it P25 or something else.. although in 700Mhz it really should be trunked and P25. And if its P25 is it P I or P II? Terrain, obstacles? Trees, antenna height? Coax, length and type?