Things change over time. It might be redundant to say so, since change, by definition, requires time in which to occur, therefore mentioning that "change happens over time" is like saying "given enough time things won't stay the same." You could just say "things don't stay the same."
Having made that point I have examples of things that have changed, and, true to form, they changed over time.
For months on end I had a recurrent zapping and buzzing sound on the x-band (the upper AM frequencies) coming from a defective street lamp that kept trying to turn on but was evidently short on viagra. But it kept trying and the zapping interfered with my weak AM signal. After searching for and finding the lamp I planned to pull over and write down the pole number so I could call the electric company, but they fixed it, bless their hearts, families, pets, and work ethic.
But another disturbance lurked in the background, that 2nd harmonic of AM 850 appearing at 1700 kHz as a buzz-blaster, made all-the-worse by the iBAH chainsawing at 1690 and 1710. This went on for a long time. It even started leaking into my signal at 1680 kHz forcing me to move to 1640.
But again, things don't stay the same, although they happen until they stop, which is a factor of passing time. This week 1700 is clean, and the noise is cured. At first I doubted this so I checked and found 850 is in operation, they still have iBAH, but their 2nd harmonic is finally supressed. What I think is that their engineer fixed it. I also think he had to wait for a part, custom made, which took awhile to come in. I could just call over there and ask about it, but I'd rather use my imagination to explain it away.
In my third paragraph I used the expression "months on end", and I have no idea what that actually means, but it's an expression we've all heard. What is "on end"?
Finally, since people tend to look for new posts but very quickly get bored reading them, I want to know how close two transmitting antennas can be spaced so as not to interfere with each other. For example, if a transmitter/antenna at 1640 kHz is one-foot away from another transmitter/antenna at 1680 kHz each one will be back-modulated by the other and neither signal will sound right. But how far apart do they need to be? 5-feet? 10-feet? 20-feet? 30-feet? 32-feet? What?
Some things never change, yet time goes by.