This paper describes a flexible loop antenna for in-body applications. This antenna works in the Med Radio band(402 MHZ–406 MHZ) which is the standard band for Bio Implantable applications, ISM Bands at 433 MHZ“434.8 MHZ and 902 MHZ“ 928 MHZ. The antenna is having a size of a 3.5 mm radius and height of 15 mm. The simulated antenna is having a Bandwidth of 228 MHZ (310 MHZ–538 MHZ) at 400 MHZ and 334 MHZ at 1GHZ having a VSWR<2. The Radiation pattern of this antenna is unidirectional having a gain of −31.7 dBi.