ABSTRAKSI: ABSTRAK Antena Hexacula chebyshev – unidireksional monotriangular 0,3 GHz -3,0 GHz ini dirancang bangun dengan dua tujuan: 1. Untuk menyediakan prototipe antena unidireksional berpita sangat lebar, supaya dapat digunakan oleh beberapa operator secara bergotong – royong, untuk menghemat menara dan lahannya 2. Untuk membuktikan hipotesis dari pembimbing 1 bahwa antena adalah pemadan impedansi antara ruang propagasi dengan saluran radio. Spesifikasi yang harus dipenuhi adalah: frekuensi kerja 0,3 GHz – 3,0 GHz dalam VSWR maksimum 1,5 pada terminal 50 Ω unbalance, gain minimum 2,14 dBi, unidireksional berpolaritas linier. Ia harus dibangun dengan saluran strip kembar jajar, berdasarkan transformator chebyshev, untuk digunakan di udara atau hampa; menggunakan balun jenis monotriangular supaya berpita lebar tetapi tanpa lilitan pada toroida. Dengan kaidah saluran strip kembar jajar diperoleh konstruksi (susunan bahan) dan ukuran masing – masing) sebagai berikut: N = 5,098 ≡ 6 tingkat, εr1= 3,78 ( kaca l1 = 23,3 mm), εr 2= 2,96 ( kertas asturo l2 = 26,4 mm), εr3 = 2,25 (puzzle l3 = 30,3 mm), εr4 = 1,96 (kertas kalender STT l4 = 32,4 mm), εr5 = 1,49 (kertas kado l5 = 37,2 mm), εr6 = 1,16 (sterofoam l6 = 42,1 mm). Menggunakan strip tembaga jajar lebar = 3,44 mm (w) x panjang = 191,7 mm (l) x spasi = 20 mm (s). Balun monotriangular dibangun dari lembaran tembaga bersudut segitiga 900, tinggi = 20 mm (s), berterminal unbalance. Melalui pengujian spesifikasi di pekarangan IT Telkom didapat hasil sebagai berikut: di dalam VSWR maksimum 1,5 ternyata frekuensi kerja 975,20 MHz – 2814,01 MHz pada terminal ZT = 50 Ω unbalance, gain = 9,34 dBi pada frekuensi 1650 MHz, berpolaritas ellips. Untuk menempatkan frekuensi kerja 0,3 GHz – 3,0 GHz dari 975,20 MHz – 2814,01 MHz disarankan dengan memisahkan catuan konduktor monotriangular dari strip konduktornya, untuk meyakinkan bahwa berpolaritas linier disarankan diuji di ruang tanpa gema berantena uji berberkas pencil.Kata Kunci : unbalance, chebyshev, monotriangular, dan prototipe.ABSTRACT: ABSTRACT Monotriangle 0,3 GHz – 3,0 GHz Chebyshev - Unidirectional Hexacula Antenna is designed on two purposes, they are: 1. To supply a wideband unidirectional antenna prototype so it can be used by some operators at once therefore economize the load of tower. 2. To prove the hypothetic of first advisor which told antenna is a device which used as a transformator between free space and transmission lines The Specifications of antenna that must be fulfilled are the working frequency 0,3GHz-3,0GHz in VSWR max. 1,5 at 50Ω unbalance, gain min. 2,14 dBi, unidirectional pattern and linear polarization. This antenna was constructed with two strip rows, by using chebyshev transformator which is used in air or vacuum. This device is also using monotriangular as balun to deliver a wideband antenna without any coil. Based on twin rows strips theory, construction is obtained (with the materials and size), like this: N = 5,098 ≡ 6 degree, εr1= 3,78 ( glass, l1 = 23,3 mm), ), εr 2= 2,96 (asturo paper, l2 = 26,4 mm), εr3 = 2,25 (puzzle, l3 = 30,3 mm), εr4 = 1,96 (STT date paper, l4 = 32,4 mm), εr5 = 1,49 (present paper, l5 = 37,2 mm), εr6 = 1,16 (Styrofoam, l6 = 42,1 mm). This antenna is also using brass strip with its size 0,344 mm (w) x 191,7 mm (l) x 20 mm (s). Monotriangular feed was built by 900brass pieces, 20mm in height, terminal 50 Ω unbalance. By measurement of these specification in IT TELKOM’s garden , the results are : in VSWR maximum 1,5 , the working frequency 975,20 MHz – 2814,01 MHz at terminal Zt 50Ω unbalance, the value of gain 9,34 dBi at 1.650 MHz , ellipse polarization. The hypothesis has been proved, it can be seen that all the results are proper to the specification, only the lower frequency and the polarization out of plan. To widen the range frequency 975,20 MHz – 2814,01 MHz by decrease the lower one should be done by attach the monotriangular feed more closer to the material and keep the conductor strip away from the monotriangular feed. For the ellipse polarization, it can be a linear one if it is measured in anechoic chamber with pencil beam antenna.Keyword: unbalance, chebyshev, monotriangular, dan prototype.