特别是如果电视机与天线距离超过超过20英寸(6米)，就得考虑买一个内置信号放大器的天线。

Think about buying an aerial with a built-in signal amplifier, especially if the television set is more than 20 feet (six metres) away.

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是一个电视信号放大器，用于连接岸线电视信号。

It is a TV signal amplifier, to be connected to shore line TV signal.

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寻求先进、高效、实用、稳定、可靠的UHF电视发射机高频线性功率放大器，至今仍是一个十分重要的技术课题。

Pointed out that it is a very important subject to look for the advanced, high-efficiency, useable, stable, reliable high linear power amplifier of UHF TVtransmitter by now.

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