A few well placed runs of fishing line should do the trick. That's what we've used on boats for years and it works pretty well. Gets in their way, trips them up coming in for a landing, etc. Birds remember this and stay away.
Note that it says it can be attached with cable ties.
How about we just forget the device and simply use the cable ties (tie-wraps)?
Did that a year ago.
Wrapped a long (8") tie around my balcony railing leaving a vertical 'tail' projecting up about 4". Repeated this the length of the railing about 4" apart. The semi-translucent "white" ones are not that noticeable (and have yet to show any signs of degradation - when they do, I'll simply replace them). Did the same along the top of the antenna and the partition between myself and the neighbour (ok, that was with duct tape).
The pigeons now much prefer somebody else's balcony. (They can't land on the railing nor the antenna nor the partition and if they land on the floor, they have a very difficult time launching up and over the railing (plus those 'tails')).
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