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Why in TV receiving Yagi-UDA antenna array the pipes are hollow?

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ayan_ns

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In our TV receiving Yagi-UDA antenna array the pipes are hollow. Is there any technical reason behind it ?

Added after 4 minutes:

The TV signal travells in the range of MHZ. now normally, at that particular freq. range the waves propagate throgh the medium in zig-zag fashion upto a penetration depth, from the periphery of the conductor not from the inside.so, inside material are fully, useless.so, it is kept as hollow.
 

Re: RF and microwave

RF signals (Microwave) has something called a skin effect, which travels on the skin or outside surface. The reason for using tubing it is cost effective.
 

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