They achieved an axial ratio beamwidth of 130\({}^{\circ}\)-150\({}^{\circ}\) and a half-power beamwidth of 115\({}^{\circ}\)-125\({}^{\circ}\) at 1.227-1.575 GHz. [PERSON] and co-workers designed a wide beamwidth antenna using bent bow-tie metal-plate dipoles with a coaxial balun fed by a two-stage Wilkinson power divider and a 90-degree phase-delay line [22]. They employed a large circular ground plane with a diameter of 1.05 \(\lambda\) and achieved a wide beamwidth by placing the crossed dipoles at 0.55 \(\lambda\) above and parallel to the ground plane. [PERSON] and co-workers designed an RHCP antenna operating at 0.28-0.40 GHz with a wide axial ratio beamwidth [23]. They employed curved printed crossed dipoles fed by a Wilkinson power divider combined with a phase-delay line. [PERSON] and co-workers designed a single-band GNSS antenna with a wide axial ratio beamwidth employing semicircular wire crossed dipoles fed in phase quadrature using a quarter-wavelength coaxial cable [24]. Their ground plane is large (0.85 \(\lambda\)) so that the dipole is placed high (0.42 \(\lambda\)) above the ground plane. [PERSON] and a co-worker proposed an ultra-low profile design (0.1 \(\lambda\)) with a 3 dB axial ratio beamwidth \(>\) 120\({}^{\circ}\), yet it exhibits limited low-elevation gain and is primarily suited for static scenarios [25]. They employed crossed bow-tie dipoles fed by a coaxial cable with an integrated 90-degree phasing ring. Four parasitic triangular patches are placed between dipole arms and shorted to a square ground plane. [PERSON] and co-workers presented low-elevation gain (0.11 dBic at \(\theta\) = 85\({}^{\circ}\)) using curved crossed dipoles in a corrugated back cavity and achieved a 3 dB axial ratio beamwidth in excess of 200\({}^{\circ}\), but the design is complex and narrow band so that it can be used only for GNSSs at the 1.6 GHz band [26]. A circularly polarized antenna radiating isotropically at all angles has a gain of 0 dBic, where the subscript 'ic' means'relative to isotropic circularly polarized radiator'. This paper proposes a novel wideband and broad-beamwidth circularly polarized crossed-dipole antenna tailored for collaborative multi-GNSS reception on highly maneuvering platforms. The core design objective of the proposed antenna is to obtain acceptable gain and axial ratio performance in the entire hemispherical angles at 1.16-1.61 GHz. The design goals are achieved by employing vertically arranged printed crossed dipoles with parasitic monopoles, a circular ground plane of optimum diameter, and a three-branch-line quadrature hybrid coupler realized on the back side of the ground plane. The designed antenna exhibits a gain \(>\) -3.3 dBic and an axial ratio \(<\) 6 dB within \(\pm\)90\({}^{\circ}\) elevation, or in the upper hemisphere, with a peak gain of 5.8 dBic. The proposed design provides broad beamwidth for multi-GNSS signal reception on attitude-changing platforms. In the following, we present a detailed description of the design of the proposed antenna conducted using CST Studio Suite, which accurately predicts the antenna's performance, eliminating the immediate need for physical prototypes. In Section 2, the design specifications and the antenna structure are described, followed by the design of a single dipole antenna in Section 3. Sections 4 and 5 deal with the design of the crossed-dipole antenna and the antenna feed network, respectively. The final design and performance of the proposed antenna are presented in Section 6, followed by the conclusion of the paper in Section 7. We present, in great detail, the design steps and intermediate results along with the dimensions of the final design so that the proposed antenna can easily be implemented even by laymen in the general technical community.