BH3XZT Antenna type: Shijiazhuang mkGP antenna Before improvement: Use a line-based ground plane with matching wavelength, and install it according to the corresponding number of elements. Improved version: Using a 2x1.5-meter electromagnetic shielding fabric as the ground grid. Performance results: Verified to work across 20+ bands, with less than 1.3 meters of standing wave in the amateur band; the 40-meter band may be due to the small size of the shielding enclosure, which prevents the standing wave from dropping below 1.3 meters. Advantages: Easy to install. Disadvantages: Currently, there are no larger-sized shielding fabrics available. To put it simply, I'm not an expert in this area, and my experience is limited. However, from my perspective, the installation of GP antennas has never been so easy before. If you have any good ideas, please leave a comment in the comments section.
Liridice I'm looking forward to more details, such as whether alligator clips can be used for connection? Would combining shielding fabric improve the standing wave in the 40-meter band?
BH2VZC I want to buy four pieces of shielding fabric. When installing them, should I use ground stakes to secure them in a line of four, passing through the corners of each piece? Would that help expand their size and potentially improve their effectiveness?
BH3XZT After testing, a 21 MHz signal reached Argentina, with -17 dBm and an S/N ratio of r-19. The following is information about the spot website provided by group members:
Lynx You need to set up another standard GP for A/B testing in order to determine whether it's working correctly or not.
BG2KAJ It can be made with copper or iron window screens. The principle of this ground network is that the maximum RF grounding current density within a radius of 1 meter is feasible.
BH3XZT BG2KAJ There's a problem: the standing wave in the 40-meter band is not going down, as shown in the diagram above, it's at least 1.6, and I'm considering whether this is because the shielding area is too small or the ground reflection is insufficient, which prevents the standing wave from decreasing.
BH3XZT Actual experience with the "野架" (Wild Rack): 1. Easy to install/set up 2. Easy to adjust 3. The shielding material can be folded and used as a protective layer for devices such as computers during travel to remote locations.
BH7HQT I've installed a mosquito net for the windows, and I'll try using it on the hammock next time.
Liridice There's a photography prop called "cloud gauze net" that is softer and holds its shape better than sheer curtains. I plan to get some of these to improve the appearance of my air conditioner unit's outdoor casing.
BH3XZT Regarding the location where the shielding fabric is attached, this five-claw clamping buckle is used. One end clamps onto the shielding fabric, and the other end clamps onto a wire. When using, ensure the latch is securely closed. The other side of the wire end is welded with a copper tip.
BG8AMG BH3XZT Considering that this antenna is essentially a dense shortwave network, to address low-frequency bands, it can be supplemented with additional ground wires around the antenna.
BH3XZT BH3XZT 选择五爪按扣时需要注意，带颜色的按扣上有油漆绝缘，不要购买，，另外目前正在考虑使用铜箔带 或者锡纸胶带 外加大力布基胶带结合的方式，加固红框处的链接位置 这种贴胶带的方式有点类似于磁吸地网的感觉了
BH4GTG I tried the method described by the original poster, and the best results I achieved were using both a ground wire and a shielded fabric simultaneously. Also, the shielded fabric doesn't need to be very large; something around 1.5 x 1.5 might offer the best value for money.
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