There are "real concerns" about the impact on the Danube, he says, as "it will increase the heavy metal content of the water and it might have adverse effects on fish".

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Once you house an antenna structure inside of an aluminum body, you also have shadowing effects to overcome, this is caused by the metal body affecting the radiated signal, as well as the inbound signals from the cell sites.

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The problem is that no-one knows what the long-term effects could be, especially when dealing with a toxic heavy metal such as silver.

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