I'm in the process of getting a Davis 6152 as well, and have been looking at the same issues as you jpmorgan49. My ISS sighting will be a compromise, as my backyard is only around 4.5m (14'9") wide. The position I have chosen is away from trees, but will be around 3m (apx 10') from the house. I'm mounting the anemometer on a 1.8m (6') rafter mount aerial pole, pretty much at the top of the roof, which will put it around 7.2m (23' 6") above ground level. I'm running cable for everything as well. Nearest structure is a double storey house around 20m away. I know I could get the anemometer to 10M (30') by guying a mast, but I'm concerned with the asthetics as well. The aerial mast at the height I'm planning is not out of place in the neighbourhood, but a 5m (16') guyed mast atop my roof would be.
ISS to be mounted on a redgum fence post (aprox 5"x3") fixed in concrete. The ISS will be around 1.5m-1.8m (5'-6') off the ground. The ISS won't be above grass though - don't have that anymore, it's all died as we're not allowed to water lawns anymore due to water restrictions. I'll probably have chip-bark or something similar underneath instead.
That flicker link is great Tinplate.