Solar Reflector/Mirror for Northerly Wall to Melt Ice

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A northerly wall without sunlight can lead to persistent sidewalk ice and frozen downspouts during winter months. Reflecting heat into this area using a metal mirror mounted on a telephone pole is a potential solution. However, standard security mirrors, which are convex, may not be effective for this purpose. An effective mirror would need to be large or capable of tracking the sun to maintain focus on the desired area. While solar heat panels that track the sun exist, they may not be a cost-effective option for this situation.
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I have a northerly wall on my house that doesn't get any sunlight to speak of.
In the winter, sidewalk ice can last for months and the downspouts freeze. The sun really helps out in clearing the ice, even in the coldest weather.

Is it possible to use a metal mirror, mounted on a telephone pole about 40 feet away, to reflect some heat into the area?
Security mirrors are typically convex, so I don't think they would work.
 
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Certainly, but the mirror would either need to be enormous or it would need to track the sun to keep its light focused where you want it.
 
I've seen that some solar heat panels track the sun, but I'm looking for something cheaper.
 

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