This is not really a technical question, but more a matter of perception. How close ( or how far away ) would you prefer to be from another ham active on HF? Currently my nearest HF neighbor is 1.2 miles away ( LOS ) and although he has a strong signal on HF there is no problem with us working the same band at the same time. I'm looking for a new QTH, where I can replace my indoor dipoles with a tower and a much more directional antenna. A month ago, I found a somewhat attractive QTH with a next door neighbor who is active on HF ( thank goodness for the searchable QRZ.com database ). I didn't buy the property for a whole host of reasons, one of which was that I wouldn't feel comfortable being that close to someone who is active on HF. Now I am considering another, more attractive QTH, and I am mapping every ham QTH within the zip code using MapQuest. So. If you had a choice, and if you were very active, averaging 30 HF QSOs a day, what would be your preferred minimum distance from another ham active on HF? Or wouldn't it matter to you?