You can use most any wire from nearly invisible magnet wire to very heavy stuff. It needs to carry only a very tiny amount of current.. Several hams use invisible magnet wire (like 40ga) for transmitting (Way more current flows in a transmitting antenna)
For a receive only antenna yes you could wrap it around the rail. or a fiberglass pole.. IT WILL affect performance. (Usually negatively) but you can wrap it.
Just be careful.. Make sure it does not come into contact with power lines (bad things happen if an antenna wire hits a power line) and make sure that if it crosses a road or other traveled place (Even if it is only foot traffic) it's up high enough.. I like 16 feet crossing a road as a MINIMUM. 10 feet on a foot path.
Home is where I park it!