At least one hollow zone is formed in a stack of at least one upper layer and one lower layer. The dual frequency operation of the PIFA is accomplished by using a slot in-the radiating element to quasi partition the radiating element. The wall of the tunnel needs to be prepared and painted white. , an advertising opportunity, for anyone having an interest in that particular item or place to communicate with the user regarding that item or related items at a point in time when the user’s focus is on the particular item. The binary TiNb alloy contains 10-30 wt % of Nb, preferably 13-28 wt % of Nb, and the balance titanium, which is suitable for making a medical implant such as an orthopedic implant or dental implant. A biasing component is provided for biasing the guiding sleeve towards the sleeve extended configuration.