Konrad, the best way is from HWY 101 take Woods road at the end of Sequim Bay. I did send you a KMZ with a route in it. It's all DNR dirt roads so you will need to follow the route that is outlined. A better spot with a view to the North than Blyn is Blue Mountain, but the road will not open till late June due to snow. Its elevation is 6500' and it is a favorite of mine to visit. There are also camping spots, but they are on the South side of the mountain. It's a great summer spot. Both sites do not require four wheel drive and can be taken by car.
The long lines 40 GHz horns and tower are no longer on the Blyn site anymore. American Tower took over that part of the site and removed them, and was sad to see them go. One of the other hops was from Blyn to Port Angeles and to the Elwha Tower just west of Port Angeles. This is where the transoceanic sea cables came in, Plus the site was nuclear hardened and had the biggest generators I have ever seen in my life! I have pictures of it both inside and out somewhere. It was really cool to explore.