Back when i started work, n fer the railway in the yearly 70,s if ya wanted to talk to the train dispatcher out online the only means was telescopic extension poles and military portable phone,,Found only one section of (4) poles (16 feet in total length) required for hook-up,,Line from portable phone wire with alligator clip was attached to wing nut then slid to make contact on open wire as shown on photo, s.gives you some idea of how ya hooked up to talk online. This type of extension poles where found on all the old speeders and jiggers back in the day.(Remember, n by gone days,)