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There are a few drawbacks to using ALM on antennas IMHO

ALM tends to weaken when bent or kinked, thus over time wind and vibration will eventually cause breakage. Solid copper will also, however copper is a much more dense material and those effects take considerably longer to occur.

Stranded Copper or Copper Clad steel core wiring is my preferred antenna wire.

Alm is harder to terminate, tho you can solder to it with special flux material, you must consider you will be connecting it with coax or Ladder line witch is copper and corrosion will begin in a matter of days(Oxidation). The exposure to outdoor elements, special care must be taken to seal the connections thoroughly. 

Just a couple thoughts

All the Best

Gary