除甚低频外,岩石不能传播无线电波,而且传播距离有限。视所在环境的需要,可借助几种形式的馈线利用商业上可用的系统,能够克服物理学定律所限定的这种限制。在低频和甚低频时,如有必要,可用简单的绝缘线接到井下管道网路上作这种馈线;而在高频或甚高频时可使用特别设计的 Except for very low frequencies, rock can not transmit radio waves and has a limited range of propagation. Depending on the needs of the environment, several commercially available systems can be utilized with several forms of feeder lines to overcome this limitation, as defined by the laws of physics. At low and very low frequencies, if necessary, a simple insulated wire can be used to connect the downhole pipeline network for such feeders; while at high or very high frequencies specially designed