A terminating resistor was used to balance out the load if your transmitting on the long wire, really not needed for reception. Coils are used were space is limited, the coils will shorten the length of the long wire, the more winding's the shorter the antenna has to be, however fopr the antenna to work as good as it can the coils need to be setup for different bands to help with proper reception in those bands. Coils can be used for 160, 80, 60, 40, 30, 20, 17, 15, 12 and 10 meter HAM bands to load down and shorten up a long wire antenna, also if your looking at VLF frequency's (630 and 2200 meters) it would be best to use a coil to shorten up the antenna, as a single long wire may stretch out of town in those bands. For AM radio bands and international short wave bands you can use a simple inverted "V" setup for ham bands and it will work fine. Just remember that the "Band" number equals the length of the wire, so one set for the 160 meter band would have two parts set at 160 meter long, this for a full wave length antenna, (that wold work the best) however you can shorten the antenna by one half or one quarter for 160 meters, (1/2 wave, 1/4 wave) this would also make the antenna work for 80 and 40 meters.