In 2014 I found a video on you tube of a man in Newfoundland who had built a solar pop can heater. I decided I would build one for my big shop in the back of my large town lot. There is a south facing wall to install it on a foot away from the wall for safety reasons as it can produce 80 -90 degree C!  I had an old double pane window in the shop that was about 3 by 7 feet. So the project began. I also had the aluminum frame from a score clock which had been removed from a school gym which turned out to be the perfect depth to fill with rows of pop cans after being insulated with 2 inch styrofoam. The metal frame also had a perfect indentation on the front to install the double pane window. See the pictures in the link below for how I  built  this pop can heater. I used a small squirrel cage fan on the inlet in the garage and another one on the outlet in the garage. There is a temperature sensor at the top of the outlet pipe connected to an adjustable digital temperature control ($8.00 on ebay). I can set any temperature to turn on the fans and I can also adjust the differential to turn off. As soon as the sun comes up and shines on the heater  it  will quickly come to the set temperature I programed of 32 C. The heater was tested to  produce up to +180 degrees F  (+80 degrees C) before I installed the fans. This is a good reason to have 2 fans so it will not melt the heater if one fan quits! Today Nov 11, 2020 the sun was very low (temperature – 12 degrees all day) but the heater quickly rose to +32 C and the thermostat turned the fans on. The heater produced a steady +18 C temp into the garage all day until there was no more sun shining on it. ! Darn nice free solar heat. 

Click the pictures in the gallery 

Click this link to see the picture gallery of this project 

I have just completed building and installing a multi-coax junction box on my tower. I have 9 coaxes coming down the tower and feeding through a 4 inch pvc conduit to the basement. Every time a thunderstorm approached I would have to go behind my operating desk in the shack and disconnect them all. Two of the lines are 7/8 inch hardline with 1/4 inch solid core center conductor. Any lightning strike would have a direct path to the shack- not great!! I had an old aluminum weather proof  box which was used for a chart recorder in a town pump house. Please see the pictures for the construction and finished product. There is also another WP box three feet away to connect the coaxes from the house to a grounding bar during bad weather. The red banana plugs ground the disconnected  coax coming down the tower after they are disconnected. This way there is no path for the lightning to enter the house through the coaxes.