之前的gp天线一直放在楼下林子里，现在找到了一处条件不错的顶楼打算将天线架设在这里，不被允许对墙体进行任何破坏，如何在此架设半永久性gp天线，看了下上个世纪清华八木那种砖石压大底座感觉比较可行 [upl-image-preview uuid=137c0f48-551f-465f-ad9e-0c4da989042f url=https://storage.hamcq.cn/2025-11-09/1762658640-730931-7413e37a82a43440d70a63fcd87180fd.jpg alt={TEXT?}]

现在清华的八木也是砖石（水泥墩子）压大底座。GP的话看看有条件要不再搞点风绳？这样底座不需要像八木那样搞很重 [upl-image-preview uuid=32cc53bf-a1fb-4fbc-bd3d-85640fb9ba76 url=https://storage.hamcq.cn/2025-11-09/1762659386-526223-09b19b1e66086be2cc2feca3756f51f3.jpg alt={TEXT?}]

角钢焊个十字底座，上面立个钢管，天线抱在钢管上。

@"Liridice"#p85657 在此基础上如果想更牢固，可以弄个转运箱拌点水泥把这个底座塞进水泥里。如果想更牢固，可以加风绳

@"BH9DWE"#p85646 gp是拉杆，现在想的是底座立杆或者灯架压沙袋做点防水

@"BI3AFQ"#p85745 拉杆那更方便了，保证连接处够牢靠的话一个水泥墩子就够用，甚至我当年搓的便携GP都是一个法兰盘固定在塑料盒子，下面拿个小三脚架撑起来的。

11/10 想起来有两根质量比较高的5.6m拉杆，打算在楼顶上正v了，底座大概用沙袋压住，这边在海边挖几袋沙子应该不会进局子我估计（

别拉杆啊，正V750好用得紧，不行上GP4，下面拼多多买个太阳伞水箱（黑色耐晒的那种，40左右），上面加压沙袋，稳定的

马路牙子那种大青砖知道吧，焊一个底座然后用这种青砖压上去，或者找一块大钢板铺到房顶再在钢板上焊一个底座，这种成本就有点高了。

拉杆随便找个管往上一捆，用铁丝都没问题，只存在拉杆断的可能

@"BH7HQT"#p85749 架正V就是用完就上楼顶去把拉杆收起来了，上这个楼顶很方便，离电台室也不远，维护频率会很高

Problems with permanently mounted GP antennas on rooftop structures.

BI3AFQ

BenRG I was doing this because GP was downstairs, and it would take me several hundred meters to walk down and adjust the antenna. To save time, I just pulled everything out and then used the antenna tuner to manually bring the SWR down to below 1.7 on some antennas, while others couldn't be brought down that low. Don't use my method.

BI3AFQ

BenRG Ideally, natural resonance should be used.

BI3AFQ

11/16
The steel pipe and sandbags for the base are all in stock. Now I'm considering whether to use straps to secure the GP base to the steel pipe, and then install the V-shaped base with long M10 bolts, or whether it would be more complicated to weld everything together.

BI3AFQ

While reviewing the student handbook to avoid potential regulatory risks, I came across this particular clause.😰

BI1JNP

The main thing to consider is the wind rope; the base is actually more stable than you might think. The GP primarily focuses on preventing it from being blown over by the wind.

BI3AFQ

BI1JNP There are very few anchor points on the roof that can be used to attach a guy rope. As a temporary antenna, it can only be deployed on calm days.

BG7NOD

BI3AFQ Drill a hole, insert the expansion screw, and then seal it with cement.

BI3AFQ

BG7NOD Drilling is not allowed here.

BG7NOD

BI3AFQ Alternatively, you can use cement to create anchor points by placing a few bricks and then securing them with more cement.

BI3AFQ

11/21
Currently, the vertical antenna (V) is only 1.7m above the ground floor. When used with an automatic antenna rotator, the results are not satisfactory. Currently, I am considering replacing it with a GP antenna or installing longer telescopic poles and longer feed lines to bring the V antenna up to a height greater than half a wavelength.

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