![Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) : Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) :](https://m.media-amazon.com/images/I/61-0OO1IlpL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) :
![Geometry of the proposed annular ring antenna. (a) Top view and side... | Download Scientific Diagram Geometry of the proposed annular ring antenna. (a) Top view and side... | Download Scientific Diagram](https://www.researchgate.net/publication/224093666/figure/fig1/AS:393838536478720@1470909832152/Geometry-of-the-proposed-annular-ring-antenna-a-Top-view-and-side-view-R-14-mm-R.png)
Geometry of the proposed annular ring antenna. (a) Top view and side... | Download Scientific Diagram
![Geometry of the proposed annular ring antenna. (a) Top view: R = 14 mm,... | Download Scientific Diagram Geometry of the proposed annular ring antenna. (a) Top view: R = 14 mm,... | Download Scientific Diagram](https://www.researchgate.net/publication/224360515/figure/fig5/AS:393886326378500@1470921226696/Geometry-of-the-proposed-annular-ring-antenna-a-Top-view-R-14-mm-R-124-mm-R.png)
Geometry of the proposed annular ring antenna. (a) Top view: R = 14 mm,... | Download Scientific Diagram
![Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) : Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) :](https://m.media-amazon.com/images/I/61-0OO1IlpL.jpg)
Amazon.com: Retevis Two Way Radio Antenna Rubber Ring Color Bands Compatible with Retevis H-777 RT22 RT21 RT27 RT22S RB18 RT17 RT18 RT19 RT28 H-777S Walkie Talkies,Rubber Ring Identify and Classify (10 Pack) :
![Sing-ring/double-ring slot antenna with R 0 = 32.3 mm, W = 3 mm, R 1 =... | Download Scientific Diagram Sing-ring/double-ring slot antenna with R 0 = 32.3 mm, W = 3 mm, R 1 =... | Download Scientific Diagram](https://www.researchgate.net/publication/359753261/figure/fig2/AS:1144394644230144@1649856353162/Sing-ring-double-ring-slot-antenna-with-R-0-323-mm-W-3-mm-R-1-283-mm-G-1-mm_Q320.jpg)