My first antenna after a 26 year absence in ham radio was a 260' long OCF fed with 300 Ohm twinlead. It was up about 90' in the air, using some huge fir trees, and the antenna ran N/S, in the clear. The feed point did sag a little, and was was at about 35/65 % lengths, as this was convenient, more than from a calculation.
Station (RF) ground was top rail of a chain link fence with each section "bonded" with sheet metal screws and wire jumpers... this fence had a total length of about 200', and was just outside the shack window.
This simple antenna was pretty damn good, tuned well, and I had no problems at all with an older MFJ VersaTuner II running a Ten Tec Omni D barefoot.
No RF in the shack at all, on any band, except when I screwed up and didn't tune the antenna correctly. My crappy PC speakers would sing like mad, and the upstairs stereo system would pick it up too.
When tuned correctly, almost all the RF went to the antenna, so no RF in the shack. Simple.
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