Can I connect 2nd antenna to Netgear N150

Anyone who drills that sloppily and doesn't use a vise isn't a source of information that I would trust. Solder on a mat or workbench, not a glossy table top. Are those his in-laws I hear in the background?

Physically, you can put two antennas on one signal source, or seven if you want. Will it do any good, or will they just interfere with each other? Your guess is as good as mine. Personally, I find it most likely that the two signals will interfere, but what do I know? Never had a ham license.
 
"Can you"? Given sufficient skillz, probably.
Should you? Probably not.

Beam shaping, interference, power level....all come into play here.

The dude in your video added a second antenna, and of course, provides no before and after results.
Will what he did work in your house? Completely unknown.

And before applying actual glue, you might want to verify it actually works.
 

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