Random Wire Antenna
Here's the word on random-wire antennae.
You have to stay away from a half wavelength on any frequency. Therefore, we came up with the following numbers to avoid (IN FEET):
| Frequency MHz | 1/2 Wave | 2nd Multiple | 3rd Multiple | 4th Multiple |
| 1.9 | 246 | 492 | 738 | 984 |
| 3.8 | 123 | 246 | 369 | 492 |
| 7.2 | 65 | 130 | 195 | 260 |
| 10.1 | 46 | 92 | 138 | 184 |
| 14.2 | 33 | 66 | 99 | 132 |
| 18.1 | 26 | 52 | 78 | 104 |
| 21.3 | 22 | 44 | 66 | 88 |
| 24.9 | 19 | 38 | 57 | 76 |
| 28.5 | 16 | 32 | 48 | 64 |
So those are the numbers we have to stay as far away from as possible when building a long-wire antenna. Here they are in order:
16 19 22 26 32 33 38 44 46 48 52 64 65 66 76 78 88 92 99 104 123 130 132 138 184 195 246 260 369 492 738 984
Some of these numbers are too close to squeeze in between them. Here are the final numbers (in my opinion) that would be good for a long-wire antenna:
29 35.5 41 58 71 83 95.5 114 161 220 305 426 615 863
73,
Jack VE3EED