so i've been running a Diamond X50 on the roof for a couple years now and it does fine for the local repeaters but i've been thinking about putting up a yagi for some weak signal stuff on 2m. the thing is i'm not sure if the gain difference is actually going to matter for what i do which is mostly just chatting on the linked repeater system and occasionally trying to work some SSB when there's a good opening.

my roof mount situation is kind of a pain because i've got a chimney mount that the X50 is on right now and adding a second mast would mean drilling through the fascia board which my wife is not thrilled about. been looking at the M2 2M5WL and some of the cushcraft stuff but honestly the prices have gone nuts lately. anyone made this switch and actually noticed a real world difference or am i just chasing gain numbers on paper

the jump from a vertical collinear to a yagi for weak signal is night and day, not gonna lie. like it's not even close once you actually try it. the X50 is a great antenna for what it is but the pattern is omnidirectional obviously so you're spreading that signal everywhere instead of focusing it where you actually want it. even a modest 5 element yagi is going to give you 10+ dBd over your vertical when you're pointed at someone and that's not nothing.

that said if you're mostly just hitting repeaters the yagi is kind of wasted energy unless you're trying to hit a distant one. the real fun starts when you get into SSB and meteor scatter and stuff like that. i built a 9 element out of some aluminum tubing from the hardware store a few years back following the DL6WU designs and it works great. total cost was maybe 40 bucks. the M2 stuff is nice but yeah the prices are rough right now. might be worth looking at homebrew if you're handy at all

i had almost the exact same setup as you and went to a 7 element yagi last spring. the fascia board thing is real, i ended up just doing a second chimney strap lower down on the chimney and running a short mast off that which avoided any drilling. kinda ugly but it works. anyway yeah for weak signal it absolutely made a difference, worked some stations on SSB i had no idea were even on the band before