Total posts : 45366
A word of caution about judging range of an INDOOR transmitter by driving along the road out front of your house. You are most likely receiving the signal from the overhead power line.
1/3 mile is 1742 ft. When I operate a transmitter in the basement with a 3 meter wire hanging across the ceiling, I get similar range. 1100 ft from my house in one direction. It drops out at the intersection where the power lines T with lines along the other road. 900 ft in the other direction where the power lines stop in front of the last house, which is several hundred ft from the next intersection. The signal is much stronger when driving in the direction where the power lines are on the same side of the road as the car. Also, there are momentary increases in the signal as I pass under feed wires that cross the road to individual houses.
When I back out from the garage to the road over a 150 ft driveway, the signal is very strong in the garage, then drops out midway and then increases dramatically again at the end of the driveway under the pwoer lines.
The same transmitter mounted outdoors about 20 ft from the house with a base-loaded antenna and a good ground has a much longer range of usable signal (about 2.3 miles in one direction) and about .3 miles in another that has the house between the antenna and the receive point. The range also suffers in directions that have a higher noise level due to commercial buildings. The direction of 2.3 miles observation is out over sparsely populated land.
This power line radiation effect is nice to have, but it isn’t very effective when more than 15 or 20 ft away from the center-line of the overhead wires. It is an artifact of having the transmitter inside the house. Increasing the power level by a factor of 10 makes the signal much stronger along the power lines, but it still drops out to an unusable level at the end of the lines.
True 360 degree range can only be achieved with a good outdoor antenna installation that’s in the clear. Even then you may experience some apparent enhancement from the power lines depending on how much of your RF current flows to ground via the power wires to the transmitter vs. the amount that flows to the ground rod and radials. A very good ground system will have a much lower impedance to ground than the power wires, so less current will flow to the power wires causing the power line radiation to be reduced in favor of better 360 degree radiation.