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If you don't want to go directly into the steel roof, then you might consider chimney mounts (if you have a chimney) or an eave/wall mount that would attach to the side of the house. Each of these will hold a mast that extends upward and can hold your antenna well above your roof line (~4-5 feet is usually good enough).
Towers are nice too, but they do tend to cost significantly more and they might result in much longer cable runs (if the cable must first run down the length of the tower and then into the house). This might not be so bad if the tower is mounted right up against the house and the cable can take a short path into the house.
If the cable lengths end up being fairly long, then a good pre-amp becomes more important, and you may end up choosing one that favors higher gain (to overcome the cable losses) as opposed to lower Noise Figure.
We're just offering suggestions and options so that you can make the best selection based on your situation.
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